Clean and possibly wash the mushrooms. Unscrew and chop the stems. Peel and chop onion. Wash and chop parsley
Heat the oil in a pan. Sear the ground pork vigorously. Brown the onion and mushroom stems. Stir in parsley. Take out everything
Boil up tomatoes and cream in the frying fat. Season with salt, pepper and marjoram
Fill the mushrooms with ground pork, place in an ovenproof dish. Spread the rest of the filling around it if necessary. Pour tomato sauce over it. Grate cheese over it. Bake in a hot oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for 25-30 minutes. Serving: puree