How do you make sour cabbage HEADS?

To make sour cabbage heads, start by removing the outer leaves of a fresh cabbage and then core it. Submerge the whole cabbage in a brine solution made of water, salt, and optional spices like garlic or peppercorns, ensuring it's fully submerged. Ferment the cabbage in a cool, dark place for several weeks, checking periodically to ensure it stays submerged in the brine. Once it reaches your desired sourness, transfer it to the refrigerator to slow the fermentation process.