Cut onions into rings, mix with meat, salt, pepper and add mayonnaise. Stir and marinate for 30 minutes. Cut the mushrooms and boil in salted water for 5 minutes. Peel the potatoes, cut into circles and put in a baking dish. Pour in water.
Then put the mushrooms, salt and pepper.
Onion meat. Bake at 200 degrees for 30 minutes.
Then sprinkle with grated cheese and bake another 15 minutes.