Place the potatoes in a large saucepan with plenty of salted water and cook for approx. 20 minutes.
Drain and remove the skin from the hot potatoes.
Press the warm potatoes through a potato ricer and knead into a dough with the flour, salt and egg. If the dough sticks to your fingers, add a little more flour. Do not knead the dough for too long, as it should not become hard.
Leave the dough to rest under a cloth for 30 minutes so that it binds together better.
Sprinkle some flour onto the work surface. Shape the dough into rolls approximately 2 centimetres thick. Cut the rolls into pieces 1-2 cm wide. Dust the gnocchi with a little flour.
Use a fork to press grooves into the gnocchi. Nonna makes it much easier: she presses a dent into the gnocchi with her index finger.
Leave the gnocchi to stand for approx. 30 minutes.
Bring a large pot of salted water to the boil. Carefully add all the gnocchi to the bubbling water. After two minutes, they will rise to the surface. Remove them with a slotted spoon, add them directly to a sauce, and the gnocchi are ready to serve.
You can enjoy the gnocchi with tomato sauce, for example, and of course sprinkle plenty of Parmesan cheese on top. If you follow the tips on "working with hot potatoes" and "letting the dough or gnocchi rest", they will turn out fantastic. It sounds very simple, but these tips really are game changers.