Kiseli Kupus (Sauerkraut)

This isn’t the shredded sauerkraut you find in jars at the store. Kiseli kupus is the Croatian way: whole cabbage heads cored, packed with salt, and fermented in a large crock for 40 days. The result is tangy, crunchy fermented cabbage leaves you can peel off whole, perfect for wrapping around fillings like sarma.

The recipe comes from a Croatian Catholic church cookbook, and the scale tells you this is community cooking. Twenty-four heads of cabbage, a full bulb of garlic, fresh horseradish, bay leaves, and quartered red bell peppers all layered in a crock, covered with water, and weighed down. The lacto-fermentation happens naturally. Salt draws moisture from the cabbage, the water creates an anaerobic environment, and beneficial bacteria do the rest.

Starting around day 10, foam will appear on the surface. Skim it daily. Keeping the brine clean prevents off-flavors and mold from developing.

Chef Tips

• Use non-iodized salt only. Iodine kills the beneficial bacteria that drive fermentation. Pickling salt or kosher salt are both good choices.
• The weight must stay heavy. Every cabbage head needs to remain fully submerged in brine. Exposed cabbage grows mold. A plate with a heavy jar or clean stone works.
• Keep the cloth clean. Replace or wash the covering cloth regularly, especially during the first two weeks when foam production is heaviest.
• Store somewhere cool but not cold. A basement, garage, or cool pantry in the 60-65°F (15-18°C) range is ideal for steady fermentation.

Variations

• Smaller batch: Scale down to 4-6 heads and use a food-grade 5-gallon bucket. Same method, same timing, more practical for a home kitchen.
• Shredded style: If you don’t need whole leaves, shred the cabbage, salt it, and pack tightly. It ferments faster, usually in 2-3 weeks.