1. Remove the outer leaves of the cabbage and discard. Cut the cabbage into quarters and remove the core. Slice the cabbage thinly.
2. Place the sliced cabbage in a large bowl and sprinkle with salt. Massage the cabbage with your hands for about 10 minutes until it starts to release liquid.
3. Pack the cabbage tightly into a fermentation jar, pressing down firmly to release more liquid and remove air pockets.
4. Place a weight on top of the cabbage to keep it submerged in its liquid. Cover the jar with a cloth and secure with a rubber band.
5. Let the jar sit at room temperature for about 7 days. Check daily to ensure the cabbage remains submerged and to release any gas buildup.
6. After 7 days, taste the sauerkraut. If it has reached your desired level of tanginess, transfer it to the refrigerator. It can be stored for several months.