Step 1 (dough): Knead egg whites, flour, salt and water into a smooth dough, roll out and flatten to a paper-thin thickness.
2nd step (filling): Cut the bell bell pepper, carrot and onion into thin slices, saute with the mushrooms in a little butter. Season with salt, pepper and nutmeg, cool. Mix well minced meat with salt, breadcrumbs, egg, pepper, nutmeg and garlic powder. Cover the dough with 350g Tilsiter slices. Spread fat and steamed vegetables evenly on it. Roll up the strudel evenly and brush with a little oil. Bake on a greased baking tray in a preheated oven for about 35-40 minutes. Remove, top strudel with 100g Tilsiter strips, bake repeatedly until cheese is melted. Serve with chopped parsley.
Step 3 (sauce): Cook sauce from butter, flour and milk. Melt 50g pieces of Tilsiter in it. Season with salt, nutmeg and juice of one lemon. Add egg and sweet whipped cream to the sauce and offer with a little dill to the strudel.