Wash the potatoes and boil in water for about 20 minutes. Quench, peel and let cool
Clean, wash and cut the savoy cabbage into coarse strips. Cut the sausage into thick slices. Fry in 1 tbsp. hot oil, remove. Fry the savoy cabbage in the frying fat. Deglaze with 100 ml water. Bring to the boil, cover and stew for about 10 minutes. Season with salt and pepper
Cut the potatoes into slices. Peel and finely chop the onions. Dice bacon and leave it crisp in a large pan. Fry the onions briefly. Take both out. Heat 3-4 tablespoons of oil in portions in the bacon fat. Fry the potatoes for about 10 minutes, turning them frequently. Add bacon and onions again. Season with salt and pepper
Fill the fried potatoes, cabbage and sausage into a greased large casserole dish or roasting pan. Mix the sour cream and eggs. Season with salt, pepper and nutmeg and pour over it. Grate cheese and sprinkle over it. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/gas: level 2) for 40-45 minutes