Sanitize all jars and utensils, then dry thoroughly to prepare for fermenting.
Remove the outer leaves from the cabbage, slice it into quarters, remove the core, and finely shred.
Transfer the shredded cabbage into a big bowl.
Sprinkle salt over the cabbage and massage it with your hands until it starts to release liquid.
Pack the cabbage firmly into clean jars, pouring in the liquid that released during massaging.
Place a clean weight or stone on top of the cabbage to keep it submerged.
Cover the jar loosely with a lid or use cloth secured with a rubber band to allow airflow.
Within the first 24 hours, the cabbage will continue to let out juice; press it down occasionally.
If liquid does not cover the cabbage after 1 day, prepare a brine by mixing 1 teaspoon salt per cup of filtered water and pour enough to submerge the cabbage.
Allow the cabbage to ferment at 60-75°F away from direct sunlight for 3 to 14 days, usually about 10-11 days.
Begin tasting after 3 days and once it reaches your preferred flavor, remove the weight and seal the jar tightly.
Store the finished fermented cabbage in the refrigerator where it will keep for up to 2 months.