Keto Sauerkraut

Annie Lampella @ Ketofocus

By Annie Lampella, Pharm.D.

Published March 7, 2021 • Updated February 20, 2026

This post may contain affiliate links. See my disclosure policy.

Sauerkraut is one of the easiest fermented foods you can make at home. Just cabbage, salt, and a jar. The tangy crunch is worth the wait, and it's naturally low carb with tons of probiotic benefits.

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Keto Sauerkraut

4.8 (4) Prep 15m Total 15m 10 servings

Ingredients

  • 1 head of cabbage
  • 2 tablespoons salt
  • 1 teaspoon fennel seeds
  • 1 teaspoon coriander seeds

Step by Step Instructions

Step by Step Instructions

1
Shred the cabbage

Shred the cabbage into thin strips using a knife, mandoline slicer or food processor.

thinly sliced pieces of cabbage next to a knife
2
Add salt & seasoning

Place the cabbage shreds in a large bowl along with salt, fennel and coriander.

green cabbage in a bowl with a potato masher
3
Press the cabbage

Press the liquid out of the cabbage by smashing it using a spoon or meat hammer. The combination of the pressing action and salt will help release the fluid from the cabbage. This will take about ten minutes.

macerating cabbage with a smasher
4
Add to the mason jar

Add a few spoonfuls to a clean, dry mason jar. Press down the cabbage as you add it with each spoonful. Keep adding cabbage and pressing it down until the liquid rises above the cabbage and the liquid is about an inch from the top of the jar. This will allow room for expansion during fermentation.

cabbage smashed down into a mason jar
5
Ferment

Screw on the lid and let sit at room temperature on the counter for at least 3 days. After 3 days, taste it. If it’s perfect, then place in the refrigerator to pause the fermenting process. If you want it tangier, let sit for a few more days.

a jar of sauerkraut fermenting on the table
Nutrition Per Serving
2 Calories
0.1g Fat
0.1g Protein
0.2g Net Carbs
0.4g Total Carbs
10 Servings
Nutrition disclaimer

The nutrition information provided is an estimate and is for informational purposes only. I am a Doctor of Pharmacy (Pharm.D.); however, this content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always consult your physician or other qualified health provider before making any lifestyle changes or beginning a new nutrition program.

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Keto Sauerkraut

Frequently Asked Questions

Can I use a different type of cabbage for this sauerkraut?

Absolutely! While green cabbage is the most common choice, you can also experiment with red cabbage or Napa cabbage for different flavors and colors.

What if I don't have fennel or coriander seeds?

No worries! You can either omit them or substitute with other spices like caraway seeds or mustard seeds to add your own twist.

How long does homemade sauerkraut last in the fridge?

When stored in an airtight container in the fridge, your keto sauerkraut can last up to 2-3 months. Just make sure to keep it submerged in its brine.

Is this sauerkraut suitable for meal prep?

Yes! I make a big batch and use it all week in salads, as a side dish, or piled on burgers and sandwiches.

What are the health benefits of eating sauerkraut?

Sauerkraut is packed with probiotics that support gut health. It is naturally low carb, so it fits right into a keto eating plan.

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a folk holding a bunch of sauerkraut next to a wedge of cabbage

I love how simple this recipe is. Sauerkraut needs just two ingredients: salt and cabbage. I add fennel and coriander seeds for extra flavor, but you can skip them if you want. That tangy crunch goes perfectly on salads, Kielbasa sausages, Reuben sandwiches, hamburgers, corned beef, or anything else you can dream up.

a reuben sandwich with cheese and corned beef

What Is Sauerkraut?

Sauerkraut is shredded cabbage and salt left to ferment for a few days to a few weeks. It makes a delicious side dish or tangy condiment that goes with just about anything.

Is Sauerkraut Keto?

Yup! Fermented cabbage is naturally low in carbs. One cup has just 2 grams, so it fits perfectly into a keto lifestyle.

fennel seeds and coriander seeds on a white wooden table

What Are the Health Benefits of Sauerkraut?

Sauerkraut is packed with fiber, minerals, vitamins, and probiotics. Like sour pickles, kefir, and yogurt, fermented foods are full of beneficial bacteria. Research shows these probiotics support healthy body weight, boost immune function, and help your body absorb nutrients better.

Fermented cabbage also supports digestion and gut health. Studies link it to better blood sugar regulation and improved cardiovascular health. The phytonutrients released during fermentation show promise in cancer research too.

With benefits like these, homemade sauerkraut is worth the effort!

How To Make Sauerkraut Safely?

Making sauerkraut at home is safe as long as you keep your equipment clean. Sterilize your utensils, make sure your mason jar is clean and dry, and use fresh cabbage.

looking into a jar of sauerkraut

What Tools Do You Need To Make Sauerkraut?

No fancy tools here. Cabbage, salt, and a jar. I recommend a wide-mouth mason jar so you can press the cabbage down easily and keep it fully submerged in the brine. If cabbage floats to the top, oxygen gets in and causes contamination. Check on your jar daily and push any floaters back down.

Is Sauerkraut Fermented?

Fermentation is a traditional method for preserving seasonal vegetables. The process adds a delicious tangy flavor and boosts the health benefits too.

How Long Does It Take to Ferment Sauerkraut?

Cabbage has natural bacteria that do all the work. Salt draws out water and kills spoilage bacteria, leaving the good stuff to ferment. Expect 3 days to 3 weeks depending on the season. Summer batches sour faster; winter takes longer. Smaller batches ferment quicker too.

I taste mine every few days until it hits the tanginess I like, then I move it to the fridge to stop the fermentation.

two heads of cabbage sliced in half

Tips and Mistakes To Avoid

Here are a few tips I have learned from making batch after batch.

Shredding Cabbage
First off, make sure that you shred the cabbage thinly. Instead of using a food processor, it is a good idea to use a mandoline slicer so that you get evenly shredded cabbage.

Flavors
I use coriander and fennel seeds, but you can experiment. Try garlic, ginger, and turmeric for an earthy version, or add shredded carrots and beets for color.

Fermentation
A common mistake is letting oxygen in. Use an airtight jar or fermentation crock so carbon dioxide can escape but oxygen stays out.

Too Much Salt
Some people end up adding too much salt to the brine solution. This gives an overpoweringly salty flavor that does not taste good. If your kraut tastes too salty, soak it in cold water for about half an hour to reduce the salt level.

Contamination
Some people do not check the sauerkraut for contamination before they eat it. Before you taste the kraut, check it for any putrid smells, sliminess or molds. If you spot such a sign, it means that the kraut is contaminated, and you must not eat it. However, if you see a mold growing on the cabbage without giving off any bad taste or smell, you can just scoop off the mold and let the process proceed. The lactic acid helps to preserve the cabbage.

Many people tend to start panicking when they see bubbles, foam or white scum during the fermentation process. Do not worry! This is a normal part of fermentation.

Follow these tips and you will have perfect sauerkraut ready to enjoy!

a forkfull of homemade sauerkraut
About the Author
Annie Lampella, Pharm.D.

Annie Lampella, Pharm.D.

Annie is a Doctor of Pharmacy, mom, and the recipe creator behind KetoFocus. With a B.S. in Genetics from UC Davis, she has over 14 years of experience developing family-friendly keto recipes based on the science of human metabolism.

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Reviews 7
4.8 Stars (4 Reviews)
  1. S
    Sarah Mar 3, 2026

    Made three other sauerkraut recipes before this one and they were all basically the same, but something about the fennel and coriander here makes it taste like it came from an actual deli.

  2. F
    Fatima Feb 28, 2026

    Added caraway seeds alongside the fennel and coriander and the flavor got so much more complex, like something from an actual deli counter. If you're on the fence about the fennel seeds, the caraway rounds it out and keeps it from tasting too sharp.

    1. Annie Lampella
      Annie Lampella Mar 2, 2026

      Caraway keeps the fennel from going too sharp. That's the trio most traditional recipes use.

  3. V
    Valerie Dec 15, 2022

    Love the flavours but waaaay too salty. The real variable in the recipe is "a head of cabbage". I guess the head of cabbage I used is much smaller than the recipe expects. Will try soaking it in cold water to make it palatable.

    1. Annie Lampella
      Annie Lampella Dec 18, 2022

      Soaking works for this batch. Small head next time, try 1.5 tablespoons instead.

  4. R
    Renee Hewitt May 5, 2022

    I think this was the best sourkraut I've ever had ..Mine took 7 days to be absolutely perfect .I love cooking and I always thought sourkraut was a hard long process never image it could be so easy lol. Well you do have to have patience 😁

    1. Annie Lampella
      Annie Lampella May 7, 2022

      Seven days is my sweet spot too. The coriander really comes through by then.

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