Mix the cabbage and salt and layer in a large container. Cover with a plate and weigh down with a can or stone. Put in a cool place for 5 days, but not in the refrigerator.
After 5 days, drain the cabbage and keep some of the brine. Rinse the cabbage thoroughly, put it in a towel and wring it out vigorously.
Mix all ingredients thoroughly, pour into a tall mason jar and squeeze out any air bubbles. Top up with brine if necessary. Leave to rest for 3 days in the refrigerator, tightly closed.