Fry the meat in portions and season. Then fry the mushrooms and onions in the same fat. Dust over 1 tablespoon flour and sauté briefly. Stir in the wine, 125 ml of water, cream and stock and bring to the boil. Let simmer for about 5 minutes.
Fold the meat into the sauce and season with salt and pepper. Put everything in a baking dish. Roughly grate the potatoes, mix with the egg and 1 tablespoon flour. Spread the rösti mixture over the strips. Bake at 200 ° C for about 45 minutes.