Discard outer leaves of your cabbage.
Cut cabbage into quarters, remove the stalks and slice into fine shreds - or chunky if you prefer.
Place cabbage in a colander (over the sink) and sprinkle with the salt.
Scrunch and break down the cabbage for 5 minutes. (You may want to wear gloves for this unless you fancy purple fingers)
Leave to rest for 10 minutes.
Rinse out the salt and drain well.
Pack the jars half full with cabbage. Add ½ teaspoon coriander seeds and a bay leaf.
Add a tablespoon of red wine vinegar and balsamic vinegar to each jar.
Pour the cider vinegar to cover the cabbage.
Pack the rest of the red cabbage into each jar and top up with cider vinegar to cover.
Seal jars with a metal screwcap lid.
After a couple of hours, check the vinegar level to make sure it completely covers the cabbage.
Store in a dry place out of sunlight.
Ready to eat after one week. Will keep for up to two months.