Clean and wash mushrooms. Cut 150 g into fine slices. Heat 1 teaspoon butter. Fry the sliced mushrooms for about 3 minutes. Season with salt and pepper, let cool down. Cut the remaining mushrooms into quarters.
Peel onions and cut into fine slices. Wash steaks and pat dry. Knead dumpling dough, egg yolk and cooled down mushrooms and form into balls (approx. 4 cm Ø). Heat 1 tablespoon butter. Fry the onion slices and mushroom quarters in it. Season with salt and pepper. Deglaze with cream and let it boil down for 3 minutes. In the meantime, fry the steaks in 1 tablespoon of hot oil on each side over high heat. Season with salt and peppercorns. Fry for 5-7 minutes over medium heat until done. Remove from the pan. Boil the meat with 1/8 litre water and stir into the mushroom vegetables.
In the meantime, fry the steaks in 1 tablespoon of hot oil on each side over high heat. Season with salt and peppercorns. Fry for 5-7 minutes over medium heat until done. Remove from the pan. Boil the meat with 1/8 litre water and stir into the mushroom vegetables. Fry the balls in 2-3 tablespoons of hot oil for about 5 minutes while turning. Serve in portions garnished with chopped parsley and pepper pancakes. Serve with a fresh salad