For the bread dumplings, finely dice 1 onion and sauté in butter, deglaze with 200 ml milk. Pour the hot milk over 250 g of dumpling bread and let it rest for 10 minutes. Add 3 eggs and 1 tablespoon of chopped parsley. Season with 1 teaspoon salt, 1 pinch of pepper, 1 pinch of nutmeg and knead loosely. Shape the dough into 8 dumplings and place in salted boiling water. Let the dumplings steep for 20 minutes.
For the mushroom sauce, clean 500 g mushrooms, wash briefly and cut into slices. Dice 1 onion, sauté 40 g butter with the mushrooms. Dust with 1 teaspoon flour. Season with 0.5 teaspoons of salt and a pinch of pepper. Pour 100 ml of water and 1 cup of cream. Let simmer for 10 minutes. Add 1 tablespoon of chopped parsley and 1 teaspoon of vinegar and season to taste.