Once cut, red cabbage has a tendency to turn blue or purple. This simple technique helps it keep its red colour.
Pour hot red wine vinegar over shredded cabbage (about 4 tbsp is enough for ½ small head of cabbage). Mix well and let stand for 5-10 minutes, then drain off excess vinegar.
Serve the red cabbage raw, tossed in a vinaigrette dressing and sprinkled with chopped parsley, or use in cooked dishes.