Clean the mushrooms, remove the stems and cut them into small cubes. Grease a heat-resistant casserole dish with a little butter and place the mushrooms in with the opening facing up. Cut the onion into cubes and fry together with the chopped mushroom stalks and the minced meat. Stir in tomato paste and season with salt and pepper to taste.
Then pour the mixture into the mushroom heads and then sprinkle them with Emmentaler. Mix the cream with the cream and mushroom seasoning and pour over the dish. Cook in a preheated oven at 200 degrees for about 15 minutes.