DIY Sauerkraut for Full GAPS

A jar of homemade sauerkraut gives you something bright and tangy to serve beside meat, eggs, or a bowl of soup. This one combines thin cabbage shreds with carrots for a little sweetness and color. You start with firm, fresh vegetables and finish with softened cabbage that still has some bite, sitting in its own pleasantly sour brine.

The method comes from Sandor Ellix Katz’s The Art of Fermentation: weigh the prepared vegetables, add 1.5 to 2% salt by weight, squeeze until juicy, and pack beneath the liquid. A scale takes the cabbage size out of the salt calculation. You do not need whey or a purchased starter.

Fermentation: Taste as the batch develops; check again around 2 weeks and allow longer for a more mature ferment. Temperature changes the pace.
Yield: 1 batch; finished volume varies with the vegetable weight.

As a working, homeschooling mom of six, I need kitchen jobs that fit around the rest of the day. Sauerkraut has a useful division of work: prepare and pack the vegetables, then let them ferment while you keep an eye on the brine. An airlock that releases gas takes daily lid-loosening out of that routine.

Cabbage and carrots make an approachable first ferment because the method has visible checkpoints. You can weigh the vegetables, calculate the salt, watch for juice as you squeeze, and see whether the weight keeps every shred below the brine. Those checks tell you more than a fixed calendar day.

Ingredients

• 1 medium head green or red cabbage, or a mixture, with 2 to 3 clean outer leaves reserved
• 2 medium carrots
• Fine mineral salt equal to 1.5 to 2% of the combined prepared vegetable weight
• Filtered dechlorinated water, only if the packed vegetables have not produced enough liquid to remain submerged

Fresh cabbage carries the microorganisms that begin this fermentation and supplies most of the liquid. Save a few clean outer leaves before shredding the head. Folded over the shreds beneath a fermentation weight, they help keep small pieces from floating above the brine.

The carrots add orange flecks and a little sweetness to the cabbage. Green cabbage, red cabbage, or a mix all work here. Choose a firm, fresh head and weigh the shreds after removing the core and damaged pieces. Red cabbage colors both the vegetables and their juice pink-purple as the batch sits.

Salt draws moisture from the shreds and favors the salt-tolerant bacteria that ferment the vegetables. Fine mineral salt is easy to distribute through the bowl. Keep the filtered, dechlorinated water for a batch that needs help staying submerged; first give the salted cabbage time to release its own juice.

Salt Calculation

Weigh the shredded cabbage and carrots in grams after the core and damaged pieces are removed. Multiply that weight by 0.015 for a 1.5% batch or by 0.02 for a 2% batch.

For example, 1,000 grams of prepared vegetables takes 15 to 20 grams mineral salt. A scale controls this formula more accurately than measuring a variable cabbage head with a fixed spoon amount.

Equipment

• Digital kitchen scale
• Large glass, ceramic, or stainless-steel mixing bowl
• Clean wide-mouth glass fermentation vessel or multiple jars sized to the actual batch
• Glass or ceramic fermentation weight
• An airlock or fermentation lid designed to release gas
• Stainless-steel knife and box grater or shredder

The scale is the tool that matters most here, because it controls the salt. A bowl big enough to squeeze in without spilling makes step 4 far less messy. Pick jars sized to the batch so each one ends up full with a little headspace, instead of one huge jar that is half air. The weight and the airlock work together. The weight keeps the solids down, and the airlock lets gas out without you opening the jar.

Method

The work in this recipe is front-loaded. Steps 1 through 7 take one focused session, and steps 8 through 10 are mostly waiting and checking. Clear some counter space, get the scale out first, and set your jars where you can reach them with wet hands.

1. Remove 2 or 3 clean outer cabbage leaves and reserve them. Quarter the cabbage, remove the core, and slice the remaining cabbage into thin shreds.
2. Shred the carrots and combine them with the cabbage.
3. Weigh the prepared vegetables. Calculate and measure mineral salt at 1.5 to 2% of that weight.
4. Sprinkle the salt evenly over the vegetables. Squeeze and massage until the cabbage softens and releases enough juice that a squeezed handful drips readily.
5. Rest the mixture for 10 to 15 minutes, then squeeze again to draw out more liquid.
6. Pack the vegetables firmly into the clean glass vessel, forcing out air pockets. Divide the batch among multiple jars if needed rather than overfilling one jar.
7. Press until vegetable juice rises above the solids. Lay a reserved cabbage leaf over the shreds and apply the glass or ceramic weight. Keep the shreds and leaf below the brine, with room above the liquid for expansion and the airlock fitted as its maker directs.
8. If the vegetables have not produced enough liquid to remain submerged by the next morning, add only enough filtered dechlorinated water to restore coverage.
9. Fit an airlock or fermentation lid designed to release gas, following its maker’s directions. Ferment out of direct sunlight at room temperature. An ordinary tightly sealed lid does not vent the pressure that fermentation creates.
10. Taste as the batch develops and again around 2 weeks. Allow longer for more mature, deeply tart sauerkraut. Temperature and salt affect the pace; the cabbage should soften and become pleasantly sour. Refrigerate when the flavor and texture suit you. Two weeks is a check, not a guaranteed finish.

What To Look For As It Ferments

During salting, the cabbage changes from dry and springy to flexible and wet. Keep squeezing until liquid runs from a handful. That extracted vegetable juice forms the primary brine.

Pack firmly enough that visible air pockets disappear and liquid rises. The reserved leaf and weight should hold loose shreds below the brine. Check that coverage whenever you look at the jar.

The first taste is a progress check. Katz suggests tasting as the ferment develops, including around two weeks and again later. Warmer rooms move faster; cooler rooms need longer. The fresh cabbage smell becomes sour, the shreds soften, and the brine tastes tangy. A few bubbles or a day on the calendar cannot tell you that every jar has reached the same stage.

In step 1, thin shreds matter. Thinner cabbage releases juice faster when you squeeze it in step 4, and it packs tighter in step 6. At step 4 you will feel the change in your hands. The shreds go from stiff and squeaky to limp, and your palms get wet. At step 5, the short rest does a lot of the work for you. When you squeeze again, more liquid pools in the bottom of the bowl. Pour every bit of that liquid into the jar with the vegetables. It is the brine.

At step 7, press down with your fist or a wooden tamper until you see liquid come up over the top of the shreds. Then lay the reserved leaf flat and set the weight on it. Look at the jar from the side. You should see a layer of brine above the leaf and no shreds floating at the top. Keeping the cabbage submerged protects it from air at the surface while it ferments.

Over the first days of step 9, expect the jar to show small bubbles and the level to rise a little as gas forms. That is one reason for the headspace in step 7. Setting the jar on a plate or tray catches any brine that seeps out.

Why It Fits Full GAPS

Cabbage, carrots, natural salt, and homemade fermented vegetables fit Full GAPS. This is a dairy-free ferment made with the vegetables’ own microbes. There is no whey, added sugar, vinegar, or commercial starter.

Salted, fermented cabbage and raw cabbage are different foods within GAPS. The fermentation is part of preparing the vegetables; it does not mean a large serving belongs at every stage. The amount you eat and whether you use the liquid or the cabbage matter.

In Dr. Natasha Campbell-McBride’s Gut and Physiology Syndrome, Intro Stage 1 introduces sauerkraut juice gradually: 1 to 2 teaspoons a day for 2 to 5 days, then 3 to 4 teaspoons a day for 2 to 5 days, increasing until a few teaspoons can go into each cup of stock or bowl of soup. Stir it into warm food rather than boiling-hot food. The uncooked fibrous cabbage is introduced at Stage 3, starting small and gradually working toward 1 to 2 tablespoons per meal.

The book also includes well-cooked fermented vegetables in Intro soups, with uncooked sauerkraut as a side dish coming at Stage 3. Its separate guidance for coming off No-Plant GAPS recommends well-matured fermented vegetables and a gradual cooked introduction. That belongs to the transition back to plant foods.

Storing And Serving Sauerkraut

Keep the finished sauerkraut refrigerated and below its brine. Use clean glass, ceramic, wood, or stainless-steel utensils when removing portions.

Save the brine when you take out a portion. It is useful in stock, and having finished sauerkraut on hand makes the egg salad and coleslaw linked below easier to put together. Measure the finished cabbage or juice in the amount each recipe calls for.

Move the jar to the refrigerator when the flavor and texture suit you. Cold slows fermentation considerably, although the sauerkraut can continue changing gradually. After taking some out, press the remaining shreds beneath the brine with a clean spoon. Keep the jar covered and refrigerated.

Once a jar is half empty, it is also half full of air. Katz recommends moving the rest into a smaller jar at that point so there is less air for mold to grow in. That one habit keeps a batch in better shape to the bottom.

For serving, a few forkfuls next to a plate of meat and cooked vegetables is the simplest way. The 2020 GAPS book suggests adding small amounts to salads, soups and stews, and blending a small batch for children or anyone with sensitive teeth, then keeping it in its own glass jar in the fridge. Add sauerkraut or its juice to food that is warm, not steaming hot, so heat does not kill the live bacteria. The brine is worth saving too. A spoonful stirred into a cup of warm meat stock is a very GAPS way to use it.

Frequently Asked Questions

How Much Salt Should I Use?

Use 1.5 to 2% of the prepared cabbage-and-carrot weight. For 1,000 grams vegetables, use 15 to 20 grams salt.

Do I Need Whey or a Commercial Starter?

No. This formula uses the native vegetable culture, mineral salt, and the vegetables’ own liquid.

What If the Vegetables Do Not Make Enough Brine?

Keep squeezing and packing first. If they still are not submerged by the next morning, add only enough filtered dechlorinated water to restore coverage.

Does the Jar Need Daily Burping?

An airlock or a lid designed to vent fermentation gas removes the need for daily burping. A tightly sealed ordinary jar is different: Katz explains that gas builds pressure and must be released. Use the airlocked setup described here and follow its maker’s directions.

When Is the Sauerkraut Ready?

Taste as the batch develops. Katz describes tasting around two weeks and again later, with the timing depending on temperature, salt, and the flavor you prefer. A lightly sour early ferment and a mature, deeply tart sauerkraut are not the same result. Refrigerate when yours has the flavor and texture you want.

Can I Use Red Cabbage Instead of Green?

Yes. The ingredient list allows green cabbage, red cabbage, or a mix. Red cabbage turns the whole jar and its brine a deep pink-purple, including the carrots. Weigh it the same way and salt it at the same percentage.

Why Weigh the Vegetables Instead of Using Spoons of Salt?

Cabbage heads vary a lot in size and water content. A fixed spoon measure can leave one batch too salty and the next too weak. Weighing the prepared vegetables means the salt matches what is actually in your bowl.

Is Sauerkraut Juice the Same as the Brine in This Jar?

Yes. The liquid that forms from squeezing and fermenting the cabbage and carrots is the sauerkraut juice GAPS recipes talk about. Take it from the jar with a clean spoon or ladle and keep the vegetables covered with what remains.

Related Recipes

Once you have a jar going, these recipes put it to work:

• Chicken Meat Stock. Use a small amount of the finished juice in warm stock according to your GAPS stage.
• Sauerkraut Egg Salad With Homemade Mayonnaise. A Full GAPS way to use the cabbage itself once eggs, mayonnaise, and the vegetables are introduced.
• Ruby Red Sauerkraut Coleslaw. Another serving idea for finished sauerkraut on Full GAPS.

If you would like more fermented foods to rotate through family meals, my upcoming Kid-Friendly Ferments Recipe Card Deck gathers those ideas into printable cards. You can find the collection through the WFLI shop. A small serving beside a familiar meal is a practical place to start.