Dab the meat dry and lay it next to each other. Spread 1 tsp. mustard on each slice, season with salt and pepper. Place 2 slices of bacon and 3 plums on each slice. Roll them up tightly to form roulades and pin them with roulade needles or wooden skewers.
Onions peel and chop finely.
Heat the lard in a large roaster or casserole. Fry the roulades in it until brown on all sides over a high heat. Take them out and fry the onions in hot frying fat. Dust with flour and sauté briefly.
Deglaze with wine, apple juice and 400 ml water and bring to the boil while stirring. Add roulades again and cover everything 1 1⁄2-1 3⁄4 Stew for hours. Wash thyme and shake dry. Pluck the leaves.
Preheat oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer). Peel, wash and slice the potatoes. Mix with salt, thyme and oil, spread on a fat pan. Bake in a hot oven for about 45 minutes, turning in between.
Savoy cabbage clean, wash, quarter and cut into strips from the stalk. Coarsely chop the nuts. Heat 2 tablespoons of butter in a large casserole. Roast the nuts in it and take them out. Heat 2 tablespoons of butter in the nut butter.
Sauté the cabbage in it while turning. Season with salt, pepper and nutmeg. Add 150 ml water and bring to the boil. Cover and stew for about 20 minutes.
Fold the walnuts into the savoy cabbage, season again. Lift out the roulades. Season sauce with salt and pepper. Arrange everything.