Quarter the red cabbage and carefully remove the center and then finely shred the cabbage with a sharp knife or on a mandolin.
Place into a large, heavy-bottomed pan with the red onion, red current jelly, red wine vinegar, red wine, butter, bay leaf and cinnamon stick and season well. Place on a medium heat and bring to a gentle simmer, then cover with a lid.
Reduce the heat and cook for about an hour and a half, stirring regularly.
Remove the lid and continue cooking for another half an hour to finish cooking and reduce the cooking liquid. Stir regularly. Check seasoning and serve.
Can be mad in advance and reheated until piping hot to serve.