Halušky s hubami (Slovak dumplings with mushrooms)

Instructions

1. Boil the potatoes in water, peel them while still warm and mash them finely.
2. Mix with the flour, the egg and a pinch of salt until you have a sticky, smooth dough.
3. Bring a large pot of salted water to the boil.
4. Press the dough through a large-holed sieve straight into the simmering water, or cut small pieces with a spoon.
5. Cook for 3 to 4 minutes; as soon as the halušky float to the surface, drain them.
6. Meanwhile, fry the sliced onions in half the butter, then add the sliced mushrooms and brown them for 8 minutes.
7. Toss the halušky with the remaining butter, add the mushrooms, adjust the seasoning and sprinkle with parsley.