Cover the potatoes with their skins and cook for 20-25 minutes. Meanwhile grate half of the Parmesan finely. Wash the wild garlic, shake dry and chop coarsely. Puree ricotta and wild garlic.
Drain, quench and peel the potatoes and immediately press them through a potato ricer or mash them very finely with a potato masher. Knead with 50 g potato flour, semolina, 1 teaspoon salt, grated parmesan, ricotta and egg yolk to a smooth dough.
If the dough is very moist, knead in some more potato flour. Form gnocchi from the dough.
Bring plenty of salted water to the boil in a wide saucepan. Add gnocchi in portions to the boiling water. Cook over medium heat for about 4 minutes until the gnocchi float on top. Lift out the finished gnocchi and let them drip off.
Meanwhile, for the tomato sauce, peel and finely dice the onion. Heat the oil in a pot. Fry the onion in it. Add tomato paste and sauté briefly. Add tomatoes and juice and chop a little.
Bring to the boil. Season with salt, pepper and 1 pinch of sugar. Simmer tomato sauce open for about 10 minutes.
Heat butter in a large coated pan. Fry the gnocchi for 3-5 minutes while turning. Wash the basil, shake dry and remove the leaves. Arrange gnocchi and tomato sauce on plates, sprinkle with basil.
Slice the rest of the Parmesan cheese over it.