Wash the meat and dab dry. Cut bacon into fine cubes. Heat oil in a pan and fry the steaks briefly on both sides. Season with salt and pepper and remove. Drain bacon in hot frying fat and add sauerkraut. Cover and stew for 5-10 minutes.
Meanwhile clean and wash spring onions and cut them diagonally into pieces. Add spring onions to the sauerkraut and braise for 2-3 minutes. Season with salt and pepper and place in an ovenproof dish with the steaks. Mix sour cream, eggs, cheese, mustard and a little salt. Pour the mixture over the casserole dish and bake in a preheated oven (electric: 200 °C / gas: level 3) for approx. 30 minutes. Tastes good with mashed potatoes