Clean the red cabbage, quarter it and cut out the stalk. Cut cabbage into large pieces and wash. Peel and chop the onion. Heat clarified butter in a pot. Fry red cabbage and onion in it.
Add bay leaf, allspice, apple juice and red wine. Season with salt and pepper, bring to the boil and cook for about 45 minutes. Stir from time to time. Bring plenty of water to the boil. Add the dumplings and cook over medium heat for about 7 minutes.
Melt the butter. Roughly chop the walnuts. Wash parsley and chop finely. Crumble bread finely. Mix walnuts, parsley, bread and butter. Remove the dumplings and let them drain. Put red cabbage, dumplings and sausage in a large casserole dish.
Sprinkle with walnut breadcrumbs. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for approx. 10 minutes.