01 - Remove any damaged outer leaves from the cabbage. Cut into quarters, remove the tough core, and thinly slice the leaves into fine shreds using a sharp knife or mandoline.
02 - Place the shredded cabbage in a large mixing bowl and sprinkle evenly with the fine sea salt. Massage the salt into the cabbage vigorously for 5 to 10 minutes until the leaves soften and release their natural juices.
03 - If desired, fold in caraway seeds, grated carrot, or thinly sliced apple and mix until evenly distributed throughout the cabbage.
04 - Transfer the cabbage and all its liquid into a sterilized fermentation crock or large glass jar. Press down firmly with clean hands or a fermentation tamper, ensuring the cabbage is completely submerged beneath its own brine.
05 - Place a fermentation weight or a clean smaller jar filled with water on top to keep the cabbage fully submerged. Cover the vessel with a breathable cloth or a fermentation lid to allow gases to escape while keeping contaminants out.
06 - Store the vessel at room temperature (65–72°F), away from direct sunlight, for 7 to 21 days. Begin tasting after 1 week and continue fermenting until the desired level of tanginess is reached.
07 - Once the preferred flavor is achieved, transfer to the refrigerator to halt fermentation. Serve chilled or at room temperature as a side dish or condiment alongside sausages, pork, or roasted potatoes.