Boil the dumplings in a cooking bag in plenty of cold salted water. Cook for about 1 minute. Then let it simmer at low heat for about 15 minutes. Then quench
In the meantime clean, wash, halve or quarter the mushrooms. Peel onions, cut into strips
Heat the fat. Fry the mushrooms until golden brown. Add onions and steam. Sauté flour in it. Stir in 350 ml water. Bring to the boil, add stock. Simmer for 5 minutes
Cut the sausages into slices. Add to the sauce with frozen peas. Stir in sour cream. Bring to the boil and simmer for another 5 minutes. Season to taste. Arrange and garnish everything
Drink: cold beer