Kimchi vs Sauerkraut: Origins, Fermentation and Key Differences

Kimchi vs sauerkraut: two of the world's most famous fermented foods, both made from cabbage, salt and lactic acid bacteria. And yet one is fiery, garlicky and full of umami, while the other is bright, sour and beautifully simple. If you've ever wondered what really sets them apart, this guide is for you.

We'll look at where each one comes from, what goes into the jar, how they ferment, which microbes do the work, and how to use them in your kitchen.

Where do kimchi and sauerkraut come from?

Kimchi: a Korean staple

Koreans have been salting and fermenting vegetables for well over a thousand years, and early forms of kimchi are often traced back to the Three Kingdoms period (57 BCE to 668 CE). Those first versions were not spicy at all. Chilli peppers only reached Korea around the end of the 16th century, and it took a while longer for the red, chilli-laced kimchi we know today to become the norm. There are now hundreds of regional varieties, from napa cabbage kimchi (baechu-kimchi) to radish cubes (kkakdugi) and refreshing water kimchi.

Sauerkraut: Central and Eastern Europe, with a possible detour via China

Most people link sauerkraut with Germany, Alsace, Poland or the Czech Republic, and rightly so: it has been a winter staple there for centuries. A popular story claims the idea came from China, where workers building the Great Wall supposedly ate cabbage soured in rice wine. Historians still debate how much truth there is in it. Either way, sauerkraut as we know it, finely shredded cabbage fermented in nothing but salt and its own juice, was shaped in Europe.

In short: fermenting cabbage is an old and widespread idea, but kimchi and sauerkraut grew up in very different kitchens.

Ingredients and flavour

Kimchi

• Made with napa cabbage (also called Chinese cabbage), a long cabbage with thick white ribs and crinkly leaves.

• Usually includes Korean radish, garlic, ginger, spring onions and gochugaru (Korean chilli flakes). Traditional recipes also add fish sauce or salted shrimp.

• At Ragi, our kimchi is 100% vegan: we use organic miso to bring that deep, savoury umami, no seafood needed.

Sauerkraut

• Made with round white or green cabbage, the tightly packed heads you find at every Swiss market in autumn.

• Often just cabbage and salt, sometimes with juniper berries, caraway seeds or grated carrot.

• Its simplicity is its charm: sour, slightly crunchy and refreshingly tangy.

How kimchi and sauerkraut ferment

Both are made by lacto-fermentation. Salt draws water out of the vegetables and keeps unwanted microbes at bay, while the lactic acid bacteria naturally present on the leaves turn sugars into lactic acid. That acid is what makes them sour and keeps them stable. Want to know more? Read our article on lacto-fermentation and salt.

Kimchi: brine, spice paste and a slow, cold ferment

• The cabbage is usually salted or soaked in brine first, then rinsed and drained.

• It is mixed with a paste of chilli flakes, garlic, ginger, a little sugar and a salty umami base (miso in our vegan version).

• It is packed tightly into jars or crocks, usually left for 1 to 3 days at room temperature, then moved somewhere cold where it keeps fermenting slowly and gets more sour over the weeks.

Sauerkraut: dry-salting and a longer ferment

• The cabbage is shredded thinly and massaged with salt (around 2% of its weight) until it releases enough juice to make its own brine.

• It is pressed under that brine and fermented at around 18 to 22°C for roughly 2 to 6 weeks, depending on the temperature and how sour you like it.

Microbes: who does the work?

Both ferments are driven by lactic acid bacteria, but the cast is not quite the same.

Kimchi

• Usually hosts a wider diversity of microbes, partly thanks to its many ingredients (garlic, ginger, chilli, radish and more).

• Common species include Leuconostoc mesenteroides, Weissella koreensis and Lactiplantibacillus plantarum (formerly Lactobacillus plantarum).

• At its peak, live, unpasteurised kimchi can contain in the region of 100 million bacteria per gram.

Sauerkraut

• A smaller cast, typically led by Leuconostoc mesenteroides at the start, then by more acid-tolerant species such as Lactiplantibacillus plantarum as it sours.

• Cabbage naturally contains vitamin C, and sauerkraut keeps some of it.

Both stay living foods as long as they are not pasteurised. Research on fermented foods and the microbes they carry is ongoing, and we follow it with great curiosity. In the meantime, we simply enjoy them for their flavour and their long place in many food cultures.

Appearance, texture and taste

Feature	Kimchi	Sauerkraut
Main vegetable	Napa cabbage, often with radish	White or green cabbage
Colour	Red-orange (from gochugaru)	Pale green to golden yellow
Texture	Crunchy, chunky, layered	Finely shredded, soft-crunchy
Flavour	Spicy, tangy, garlicky, umami	Sour, salty, mild
Fermentation	A few days at room temperature, then slow and cold	Several weeks at cool room temperature

How to use them in the kitchen

Kimchi

• On rice bowls, ramen or bibimbap: try our kimchi fried rice with smoky tempeh

• In kimchi pancakes (kimchijeon) or grilled sandwiches

• As a side with tofu, tempeh or a barbecue

• Stirred into stews and soups for a spicy, tangy kick

For more ideas, here are 7 reasons to add kimchi to your dishes.

Sauerkraut

• On sandwiches, burgers and vegan hot dogs

• Mixed into potato salads or slaws

• With rich dishes such as vegan sausages, to cut through the heaviness

• Baked into bread or savoury muffins

Tip: add fermented foods at the very end of cooking, or serve them raw, to keep the live cultures alive. Strong heat kills most of them, although the flavour stays.

Real ferment or quick pickle? Check the label

Some industrial sauerkraut and "quick" kimchi skip fermentation and rely on vinegar for their sourness. They may taste similar at first bite, but they are pickles, not living ferments. (Curious about the difference? Read pickling vs fermenting.) When you shop, look for:

• "Unpasteurised" or "raw"

• "Contains live cultures"

• No vinegar in the ingredients

Kimchi or sauerkraut: which one should you choose?

Why choose? Kimchi is bold, spicy and garlicky, sauerkraut is clean, sour and mellow. Both carry centuries of food culture in a jar, and both deserve a spot in your fridge.

At Ragi, we make our kimchi in small batches in Lutry: alive, unpasteurised and 100% vegan. Kept in the fridge, it lasts up to 2 years and simply grows tangier with time. Taste the difference with our kimchi pack.