Fermenting Vegetables at Home: Sauerkraut, Kimchi & Beyond

If you've never fermented anything before, vegetables are the place to start. Not kombucha (which needs a SCOBY), not yogurt (which needs temperature control), not sourdough (which needs daily feeding). Vegetables need two things: salt and a jar. That's it. Lacto-fermentation works because Lactobacillus bacteria (which already live on the surface of every fresh vegetable) thrive in a salty, oxygen-free environment. When you salt cabbage and pack it into a jar, you're creating exactly those conditions. The Lactobacillus get to work converting natural sugars into lactic acid, which preserves the vegetables, creates that tangy flavor, and makes the environment too acidic for harmful bacteria to survive. The "lacto" in lacto-fermentation has nothing to do with dairy or lactose. It refers to lactic acid, the compound these bacteria produce. Every fermented vegetable in this guide is naturally dairy-free and (when made with the right ingredients) naturally gluten-free. This is how humans preserved vegetables for thousands of years before refrigeration. Sauerkraut in Germany, kimchi in Korea, curtido in El Salvador, torshi in Iran: every food culture on earth developed its own version of salt-fermented vegetables because the method is that reliable. If you can chop vegetables and measure salt, you can do this. And the payoff goes beyond preservation. Fermented vegetables are among the richest natural sources of probiotics, live beneficial bacteria that support gut health and immune function. Store-bought sauerkraut from the regular grocery aisle is almost always pasteurized, which means the bacteria are dead. When you ferment at home, you get the real thing: billions of live cultures in every forkful.

Every fermented vegetable (from sauerkraut to kimchi to pickles to fermented jalapeños) follows the same four principles. Master these and you can ferment anything.

1. Salt Draws Out Water and Creates Brine

When you toss chopped or shredded vegetables with salt, osmosis pulls water out of the cells. This liquid becomes your brine, the salty solution that submerges the vegetables. For shredded vegetables like cabbage, the salt-and-massage technique produces enough brine naturally. For whole or chunky vegetables like cucumber pickles, you make a separate brine solution and pour it over.

2. The Salt Concentration Controls Everything

Salt does three jobs: it pulls water out of the vegetables, it inhibits harmful bacteria while Lactobacillus get established (they're more salt-tolerant than most pathogens), and it keeps vegetables crisp by slowing the breakdown of pectin. The magic range is 2-3% salt by weight, enough to do all three jobs without making the final product too salty to enjoy.

3. Anaerobic Conditions Are Non-Negotiable

Lactobacillus are anaerobic; they work without oxygen. Molds and yeasts (the things you don't want) need oxygen. By keeping vegetables submerged beneath brine, you create an oxygen-free environment where the good bacteria thrive and the bad ones can't. This is why every fermentation instruction emphasizes keeping everything below the brine line.

4. Time and Temperature Determine Flavor

Warmer temperatures (70-75°F / 21-24°C) speed up fermentation. Cooler temperatures (60-65°F / 15-18°C) slow it down but produce more complex flavors. You control when fermentation "ends" by moving the jar to the refrigerator, which slows bacterial activity to a crawl. There's no single right answer; you taste as you go and refrigerate when you like the flavor. For detailed guidance on how temperature affects your results, see our temperature and timing guide.

The Two Techniques

All vegetable fermentation uses one of two approaches: Dry-salting (for shredded/chopped vegetables): Toss vegetables with salt, massage or squeeze until they release enough liquid to submerge themselves. Used for sauerkraut, kimchi, and any shredded ferment. Brine method (for whole/chunky vegetables): Dissolve salt in water to make a brine, then pour it over vegetables packed into a jar. Used for whole pickles, carrot sticks, green beans, and any vegetable you want to keep intact.

Sauerkraut is the gateway ferment for a reason. One ingredient (cabbage), one seasoning (salt), one technique (massage and pack). If you've been searching for how to make sauerkraut, this is the method we've refined over dozens of batches and the one we recommend to every beginner.

What You Need

Ingredient/Equipment	Amount	Notes
Green cabbage	1 medium head (~2 lbs / 900g)	Remove outer leaves, reserve one
Non-iodized salt	18-22g (about 1 tablespoon + 1 teaspoon)	2-2.5% of trimmed cabbage weight
Wide-mouth quart jar	1	Mason jar works perfectly
Kitchen scale	1	Essential for consistent salt ratios
Large mixing bowl	1	Biggest you have

Step 1: Weigh and Shred the Cabbage

Quarter the cabbage and cut out the core. Shred it into thin ribbons, about the width of a nickel or slightly thinner. Pile it into a large bowl and weigh the shredded cabbage. Write that number down. This is the number your salt calculation is based on.

Step 2: Calculate and Add Salt

Multiply your cabbage weight by 0.02 (for 2%) to 0.025 (for 2.5%). For a 900g cabbage, that's 18-22g of salt. Sprinkle the salt over the cabbage and toss to distribute evenly. The 2% vs 2.5% decision: Start at 2% if you prefer milder sauerkraut and plan to ferment for a shorter time (5-7 days). Go to 2.5% if you want a slower, more complex ferment, a crunchier texture, or you're fermenting in a warm kitchen above 72°F (22°C). Both work. Both are safe. It's a flavor preference.

Step 3: Massage Until the Brine Appears

This is the most physical step. Squeeze, scrunch, and massage the salted cabbage with clean hands. Within the first minute, the cabbage starts feeling damp. By 5 minutes, you should see liquid pooling in the bottom of the bowl. Keep going for about 8-10 minutes total; you want enough brine that when you press the cabbage down, liquid rises above it. Fresh, in-season cabbage releases more water than older cabbage. If your cabbage isn't producing enough liquid after 10 minutes, let it rest for 30 minutes and come back, as the salt continues working.

Step 4: Pack the Jar Tightly

Grab handfuls of cabbage and pack them into your jar, pressing down firmly with your fist or a wooden spoon after each addition. Push out air pockets as you go. Pour any brine left in the bowl into the jar. The brine must rise above the cabbage. If it doesn't quite cover, press down harder; more liquid will release. As a last resort, you can add a small amount of 2% saltwater (10g salt dissolved in 500ml water) to top it off.

Step 5: Keep It Submerged

Take that outer cabbage leaf you reserved and trim it to fit just inside the jar mouth. Press it down on top of the shredded cabbage; this acts as a natural "follower" that keeps small shreds from floating above the brine. You can also use a small glass weight, a zip-lock bag filled with brine, or even a clean rock. The goal is simple: cabbage stays under liquid.

Step 6: Cover and Wait

Cover the jar loosely; you need to let CO2 escape during active fermentation. A loosely placed lid (not screwed tight), a piece of cloth secured with a rubber band, or a dedicated fermentation lid with an airlock all work. Place the jar on a plate or in a bowl to catch any overflow during the first few days of active bubbling. Set it somewhere at room temperature (65-75°F / 18-24°C) and out of direct sunlight. Then walk away.

Step 7: Taste and Decide

Start tasting at day 3. The sauerkraut will be mild and barely tangy. By day 5-7, you'll notice real sourness developing. By day 10-14, it'll be fully sour with complex flavor. When it tastes good to you, screw the lid on tight and move it to the refrigerator. There is no objectively "done" point; it's done when you like the taste. See our fermentation safety guide for information on what to look for if anything seems off during the process.

Kimchi follows the same lacto-fermentation principles as sauerkraut but adds aromatics, heat, and funk. Traditional kimchi includes gochugaru (Korean red pepper flakes), garlic, ginger, scallions, and often some form of seafood or fish sauce for umami. Making it at home lets you control every ingredient, especially important if you're cooking gluten-free.

The Gluten-Free Consideration

Traditional kimchi sometimes includes wheat flour paste as a thickener for the seasoning and saeujeot (salted shrimp) or fish sauce, some brands of which contain wheat. For a confidently gluten-free kimchi:

• Skip the flour paste entirely. It helps the seasoning stick, but kimchi ferments perfectly well without it. If you want a paste-like consistency, blend a small piece of Asian pear or use a tablespoon of sweet rice flour (which is made from glutinous rice and is naturally gluten-free despite the confusing name).
• Use certified GF fish sauce such as Red Boat, or skip the fish sauce and use a combination of miso (certified GF) and a pinch of salt for umami depth. For a fully vegan kimchi, use soy sauce (GF tamari) or coconut aminos.
• Gochugaru itself is gluten-free: it's simply dried Korean chili peppers, ground. No wheat is involved. Buy from a Korean grocery or online where it's sold as a single ingredient. Check the label if purchasing a pre-made seasoning blend, but pure gochugaru is safe.

Basic Napa Cabbage Kimchi

Ingredients (makes 1 quart):

• 1 medium napa cabbage (~2 lbs / 900g), cut into 2-inch pieces
• 2 tablespoons non-iodized salt (for initial salting)
• 3-4 tablespoons gochugaru (Korean red pepper flakes), adjust to heat preference
• 4 cloves garlic, minced or grated
• 1 tablespoon fresh ginger, grated
• 1 tablespoon GF fish sauce (or substitute above)
• 1 teaspoon sugar (feeds the fermentation, optional)
• 4 scallions, cut into 1-inch pieces
• 1 medium carrot, julienned or grated (optional)
• 1 medium daikon radish, julienned (optional but traditional)

Method:

1. Salt the cabbage. Toss the napa cabbage pieces with 2 tablespoons salt in a large bowl. Let it sit for 1.5-2 hours, tossing every 30 minutes. The cabbage will wilt significantly and release a lot of liquid. Rinse the cabbage 2-3 times with cold water and squeeze it dry. This removes the excess salt; the seasoning paste adds more.
2. Make the seasoning paste. Combine gochugaru, garlic, ginger, fish sauce (or substitute), and sugar in a small bowl. It should form a rough, wet paste. Add a tablespoon of water if it's too dry to spread.
3. Combine everything. In a large bowl, toss the drained cabbage with the scallions, carrot, daikon, and the seasoning paste. Use gloves, as gochugaru will stain your hands and sting any cuts. Mix thoroughly so every piece of vegetable is coated.
4. Pack into a jar. Press the kimchi into a wide-mouth quart jar, pushing down firmly so the liquid rises above the vegetables. Leave at least an inch of headspace; kimchi produces a lot of CO2 and will expand.
5. Ferment. Cover loosely and ferment at room temperature for 1-5 days, pressing the vegetables below the brine daily. Kimchi ferments faster than sauerkraut because of the added sugars from the garlic and vegetables. Taste daily starting at day 1; some people prefer young kimchi (barely fermented, still crunchy and fresh) while others wait for the deeper sour-funk that develops by day 3-5.
6. Refrigerate. When it reaches your preferred sourness, seal and refrigerate. Kimchi will continue to slowly ferment even in the fridge, becoming more sour over weeks. This is normal and expected.

Fermented pickles (real pickles, not the vinegar-brined kind at the store) are whole cucumbers fermented in saltwater brine. They're what people mean when they say "kosher dill pickles" in the traditional sense: tangy, garlicky, with a clean sour crunch that vinegar pickles can't replicate. The difference between fermented pickles and vinegar pickles is fundamental. Vinegar pickles are soaked in an acidic solution; they're preserved but not fermented. Fermented pickles develop their acid naturally through lacto-fermentation. The result is a more complex, nuanced sourness and, crucially, live probiotic bacteria that vinegar pickles completely lack.

The Brine Method

Unlike sauerkraut and kimchi, whole cucumbers don't release enough liquid when salted to create their own brine. You need to make a separate brine and pour it over the cucumbers. Brine formula: Dissolve 35-50g salt per liter of water (roughly 3.5-5%). For pickles, we lean toward the higher end (5%) because cucumbers are watery and dilute the brine as they ferment. Ingredients (one half-gallon jar):

• 1.5-2 lbs (680-900g) small, firm pickling cucumbers (Kirby type preferred)
• 1 liter water (filtered or dechlorinated; chlorine inhibits fermentation)
• 50g non-iodized salt
• 4-6 cloves garlic, smashed
• 1 tablespoon whole dill seed or 2-3 heads of fresh dill
• 1 teaspoon whole black peppercorns
• 1-2 grape leaves, oak leaves, or horseradish leaves (optional, for crunch)

The Grape Leaf Tannin Trick

Grape leaves (or oak leaves, or horseradish leaves) contain tannins that inhibit the enzyme pectinase, which is what makes cucumbers soften during fermentation. Adding a leaf or two to your jar helps maintain that satisfying crunch. If you don't have grape leaves, a pinch of black tea (which also contains tannins) works as a substitute. This isn't essential (plenty of people make crunchy pickles without it), but it provides an extra margin of crunch insurance, especially in warm kitchens.

Method

1. Choose your cucumbers carefully. Use small, firm pickling cucumbers. Supermarket slicing cucumbers are too watery and go soft. Cut a thin slice off the blossom end of each cucumber (the end opposite the stem); the blossom end contains enzymes that soften pickles.
2. Pack the jar. Layer garlic, dill, peppercorns, and grape leaf on the bottom. Pack cucumbers in vertically as tightly as possible; they should wedge against each other.
3. Add brine. Dissolve salt in water (room temperature or slightly warm to help dissolving, then cool to room temp before adding). Pour over cucumbers to cover completely. Place a weight or a small jar filled with brine on top to keep cucumbers submerged.
4. Ferment. Cover loosely and ferment at room temperature.

Half-Sour vs Full-Sour

Half-sour pickles (3-5 days): Bright green, crunchy, mildly tangy with a fresh cucumber flavor still present. These are the classic New York deli pickle. Refrigerate as soon as they reach a mild tang. Full-sour pickles (1-3 weeks): Olive-green throughout, fully sour, more pungent. The cucumber flavor is completely transformed into pure dill pickle territory. These have a longer shelf life in the fridge. Taste daily starting at day 3 and refrigerate at your preferred stage. The brine will turn cloudy; this is completely normal and is a sign of active, healthy fermentation.

Once you've made sauerkraut and pickles, the door is wide open. Almost any vegetable can be lacto-fermented. Here are the ones we come back to most often, with specific guidance for each.

Fermented Carrots

Cut into sticks, coins, or shred them. Carrots are high in sugar, so they ferment faster than cabbage and develop a pleasantly sweet-sour flavor. Brine method: pack carrot sticks vertically in a jar, cover with 3% brine. Add garlic, ginger, or cumin for variation. Ready in 5-7 days.

Fermented Beets

Peel and cut into wedges or thin slices. Beets ferment beautifully and produce a stunning deep red brine that's delicious on its own (it's essentially homemade beet kvass). Brine method: 3% brine, 7-10 days. Add a few cloves, a cinnamon stick, or fresh orange peel for a complex flavor. Be aware that beet ferments can develop a slightly earthy aroma during fermentation that mellows in the fridge.

Fermented Radishes

Slice thinly or quarter them. Radishes lose some of their raw peppery bite during fermentation and develop a milder, more complex flavor. Daikon radishes are traditional in many Asian ferments. Brine method: 3% brine, 4-7 days. Try them with garlic and a strip of kombu seaweed for umami.

Fermented Jalapeños (and Other Hot Peppers)

Slice into rings or ferment whole (pierce with a knife to allow brine penetration). Fermentation mellows the raw heat slightly and adds a tangy depth that makes these ideal for topping tacos, nachos, or pizza. Brine method: 3.5% brine (slightly higher for peppers), 5-7 days. Mix in garlic cloves and onion rings. These are the starting point for homemade fermented hot sauce; just blend them with some of the brine when done.

Fermented Green Beans (Dilly Beans)

Trim to fit your jar vertically. Green beans stay remarkably crunchy through fermentation and make an incredible snack or cocktail garnish. Brine method: 3.5% brine with garlic, dill, and red pepper flakes. 5-7 days. Add a grape leaf for extra crunch insurance. These rival any store-bought pickled green bean and have the probiotic advantage.

General Guidelines for Any Vegetable

• Shredded/chopped vegetables: Use the dry-salt method at 2-2.5% salt by weight. Massage until brine forms.
• Whole or chunky vegetables: Use the brine method at 3-5% salt. Pour brine over packed vegetables.
• Harder vegetables (carrots, beets) take longer than softer ones (radishes, peppers).
• Mix and match. Some of the best ferments are mixed vegetable jars, such as carrots, cauliflower, garlic, and jalapeño together, for example, or a "giardiniera" mix of whatever you have on hand.

Salt is the only essential ingredient in lacto-fermentation besides the vegetables themselves, so choosing the right salt matters. The good news is most salts work fine. The bad news is the one salt most people have in their kitchen (iodized table salt) is the one you shouldn't use.

Salts That Work

• Sea salt (fine or coarse). Our default recommendation. Dissolves easily, no additives, widely available. Fine sea salt is easier to weigh accurately; coarse sea salt takes longer to dissolve but works the same once it does.
• Kosher salt (Diamond Crystal or Morton's). Works well, but volume measurements are unreliable because the flake size varies between brands. Diamond Crystal weighs about half as much per tablespoon as Morton's. Always weigh kosher salt. By weight, it's identical in function to sea salt.
• Himalayan pink salt. Works fine. The trace minerals add nothing meaningful to fermentation at the concentrations present, but they don't interfere either.
• Pickling salt. Pure sodium chloride, very fine grain, dissolves instantly. Excellent choice if you find it.

Salts to Avoid

• Iodized table salt. The iodine can inhibit Lactobacillus activity and slow or stall fermentation. The anti-caking agents can also make brine cloudy in an unappealing way (different from the healthy cloudiness of active fermentation). Will it completely prevent fermentation? Not always. But it introduces unnecessary variables. Use any other salt instead.
• Salts with anti-caking agents. Calcium silicate and similar additives can interfere with fermentation and make brine look gritty. Check the label; if anything besides "salt" is listed, choose a different option.

The 2-3% Rule Explained

When we say "2% salt," we mean 2% of the weight of the vegetables (for dry-salting) or 2% of the total weight of water plus vegetables (for brine). In practice:

• 2% by vegetable weight: For every 1000g of vegetables, use 20g salt. This is the standard for sauerkraut and kimchi.
• 3-5% brine: For every 1000ml of water, dissolve 30-50g of salt. This is the standard for whole pickles and vegetable sticks.

Below 2%, you risk not having enough salt to suppress harmful bacteria during the first critical days. Above 5%, fermentation slows dramatically and the result tastes unpleasantly salty. The sweet spot for most vegetable ferments is 2-3%.

One of the most stressful parts of fermentation for beginners is not knowing whether things are going right. Here's what a typical vegetable ferment looks like at room temperature (68-75°F / 20-24°C). Cooler temperatures will stretch these timelines; warmer will compress them. For a deep dive into how temperature shapes your ferments, see our complete temperature and timing guide.

Days 1-2: The Quiet Phase

Not much visible activity. The Lactobacillus bacteria are multiplying and getting established, but you won't see much evidence yet. The brine may start to look slightly cloudy by day 2. You might notice a few tiny bubbles clinging to the vegetables. The vegetable still tastes mostly like a salted version of itself.

Days 3-5: Active Fermentation

This is when things get lively. You'll see steady bubbling, sometimes vigorous enough to push brine up and over the jar lip (this is why we said to put the jar on a plate). The brine turns noticeably cloudy. You might notice a slight funky smell, tangy and sour, not rotten. The flavor starts shifting from "salty vegetable" to "tangy fermented vegetable." This is the half-sour stage for pickles and the early-eating stage for sauerkraut.

Days 5-10: Flavor Development

Bubbling slows as the bacteria consume the available sugars. The sourness deepens and becomes more complex. Sauerkraut starts tasting like proper sauerkraut. Kimchi develops its signature pungent tang. The brine is fully cloudy. Any vegetables that were still crunchy start softening slightly (though they should still have good texture; if they're mushy, something went wrong).

Days 10-21: Deep Fermentation

Bubbling is minimal to nonexistent. The pH has dropped significantly (below 4.0 if you're measuring). Flavors are deep, complex, and fully sour. Sauerkraut at this stage has the strong tang that sauerkraut lovers crave. Some people ferment for four to six weeks for even more funk and complexity, particularly in cooler temperatures.

When to Refrigerate

There is no single "correct" endpoint. Taste your ferment daily starting around day 3, and move it to the fridge when you enjoy the flavor. Refrigeration dramatically slows (but doesn't completely stop) fermentation, essentially freezing the flavor profile at whatever stage you liked it.

Plain sauerkraut is beautiful, but once you're comfortable with the basic method, variations are where things get exciting. The base technique doesn't change; you're just adding ingredients to the jar alongside your vegetables.

Classic Sauerkraut Variations

• Caraway sauerkraut: The classic German approach. Add 1-2 teaspoons of caraway seeds per quart. Warm, slightly anise-like flavor that pairs perfectly with sausages and pork.
• Juniper berry sauerkraut: Add 6-8 lightly crushed juniper berries per quart. Pine-forward and aromatic, the traditional Central European variation.
• Garlic dill sauerkraut: Add 4-5 smashed garlic cloves and 1 tablespoon of dill seed per quart. Essentially a sauerkraut that tastes like a dill pickle. Excellent on sandwiches.
• Apple sauerkraut: Toss 1 peeled, grated apple per quart into the cabbage before packing. The apple sugars accelerate fermentation slightly and add a subtle sweetness that mellows the tang.

Spice Additions for Brine Ferments

• Turmeric and black pepper: Add 1 teaspoon ground turmeric and ½ teaspoon black peppercorns to carrot or cauliflower ferments. Beautiful golden color and an anti-inflammatory boost. The piperine in black pepper increases turmeric absorption.
• Cumin and coriander: 1 teaspoon each, slightly crushed, added to carrot sticks or mixed vegetable ferments. Warm, Middle Eastern-inspired flavor.
• Bay leaf and mustard seed: Classic pickling spices that work beautifully in any brine ferment. 1-2 bay leaves and 1 teaspoon yellow mustard seeds per quart.
• Garlic and chili: Smashed garlic cloves with dried chili flakes or whole dried chilis; works with almost any vegetable. Start with 2-3 cloves and ½ teaspoon chili flakes and adjust from there.

Tips for Experimenting

Fresh herbs (dill, cilantro, basil) are best added in the last few days of fermentation or after moving to the fridge; long fermentation can turn them slimy and dull their flavor. Dried spices and hardy herbs (rosemary, thyme, bay) hold up well through the full ferment. Garlic can be added at the start and actually improves during fermentation; fermented garlic cloves are a byproduct worth eating on their own.

One of the great advantages of fermented vegetables is their longevity. Properly fermented and stored, they last months, and in some cases well over a year.

Refrigerator Storage (Recommended)

Once your ferment reaches the flavor you want, move it to the refrigerator with a tight-fitting lid. The cold temperature slows bacterial activity to a crawl, preserving the flavor and texture at roughly the stage you stopped it. Expect:

• Sauerkraut: 6-12 months refrigerated, often longer. The flavor will continue to develop very slowly, becoming more mellow over time.
• Kimchi: 3-6 months refrigerated. It will continue to sour gradually. Older kimchi is excellent for cooking: kimchi fried rice, kimchi stew, kimchi pancakes.
• Fermented pickles: 3-6 months for best texture. The crunch will eventually soften over many months, though the flavor stays good. Half-sours have a shorter window (4-6 weeks) before they become full-sour.
• Other fermented vegetables: Generally 3-6 months in the fridge. Harder vegetables (carrots, beets) hold up longer than softer ones (radishes, peppers).

Signs Your Ferment Is Still Good

Sour smell, tangy taste, vegetables still have some texture, brine is cloudy but not slimy. Fermented vegetables can develop white, powdery kahm yeast on the surface; this is harmless (it's an aerobic yeast that appears when oxygen reaches the surface). Scrape it off, make sure vegetables are re-submerged, and continue eating. It doesn't affect safety or significantly affect flavor.

Signs Something Went Wrong

Foul or putrid smell (not just sour or funky, genuinely rotten), pink or black mold (fuzzy growth, not kahm yeast), slimy vegetables with no structure, or an off-putting flavor. When in doubt, trust your nose; healthy ferments smell sour and tangy, not rotten. See our full safety guide for more detail on identifying problems and when to discard a batch.

Can You Ferment in a Mason Jar?

Absolutely. Wide-mouth mason jars are the most popular fermentation vessel for beginners and experienced fermenters alike. They're affordable, easy to clean, the wide mouth makes packing easy, and you can see the fermentation happening. You don't need a specialized fermentation crock (though they're nice for large batches). You don't need an airlock lid (though they're convenient). A standard mason jar with the lid placed loosely on top works perfectly for every ferment in this guide. The only real advantage of specialized equipment is convenience: airlock lids mean you don't have to burp jars, and ceramic crocks maintain temperature more consistently. But a $3 mason jar produces sauerkraut that's identical to what comes out of a $100 crock. Start with jars. Upgrade if and when you want to. For a complete equipment breakdown and our recommended tools, see the fermentation tools guide.