Slice the red cabbage into fine strips. Finely grate the apple. Mix the cabbage with the apple, a little salt and the red wine vinegar and marinate for about 1 hour.
Caramelize the powdered sugar in a saucepan over medium heat. Add the red cabbage and the liquid created by the marinade and sauté briefly. Add red wine, broth, onion, bay leaf and clove and simmer over a mild heat for about 1.5 hours until soft. After 1 hour, mix the piece of cinnamon bark, the cranberries and the chopped plums into the red cabbage. Just before serving, remove the cinnamon, cloves and bay leaf and melt 20 g dark chocolate in the red cabbage. Add salt and sugar to taste.
Red cabbage tastes particularly good if you cook it the day before and then warm it up.