Soak the buns. Peel and finely chop the onions. Knead minced meat, ground pork, pressed rolls, half onions, eggs, mustard, marjoram, pepper and a little salt.
Form approx. 16 meatballs with moistened hands. Place them side by side in a wide ovenproof dish. In a preheated oven (electric cooker: 200 °C/circulating air: 175 °C
Clean the mushrooms, wash if necessary and cut into slices. Fry in hot oil in portions. Fry the rest of the onions. Season with salt and pepper. Add 400 ml water and cream. Stir in soup powder and bring to the boil. Simmer at low heat for about 3 minutes, stirring more often
Pour mushroom cream over the meatballs, braise in the oven open for another 20 minutes. Arrange and garnish. Served with: country bread or boiled potatoes