Sauerkraut is besides being super delicious in almost any salad, super healthy! Fermented foods have benefits like being easier to digest, having many healthy gut promoting bacteria, probiotics and technically even B12.
It’s an immersive process, but actually not that difficult. The only two ingredients you need are firm cabbage (white or green is what I have tried and works, not tried others), and salt.
Then to give it more flavour you can add extra spices that you wish.
Also check out this pickled onions recipe that people rave about!

How to make homemade sauerkraut
Description
Super healthy homemade sauerkraut.
Ingredients
Spices
Instructions
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Remove the dirty spots from your cabbage (if you don't the cabbage might not ferment).
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Cut in small pieces, and process with a food processor. Pieces should be small.
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Add the salt and start squeezing a lot for about 30 minutes, depending on the amount.
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Layer the sauerkraut in a big pot alternating between spices and cabbage.
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Close with a lid, cover it and let ferment for 2-3 weeks, depending on your local climate (hotter=less time).