Peel the potatoes, cut them into smaller pieces, and boil them in salted water for about 20 minutes, or until tender.
Drain the cooked potatoes, mash them in a bowl, and let them cool completely.
Add the flour, egg yolk, and a pinch of salt to the cooled potatoes. Knead until you have a soft, homogeneous dough.
Divide the dough into four parts. Roll each part into a log about 2 cm thick, then cut into small pieces. Gently press each piece with a fork to create the characteristic gnocchi pattern.
Bring a large pot of water to a boil. Add the gnocchi in smaller batches. Once they float to the surface (about 2 minutes), drain them and set aside.
Heat the olive oil in a skillet over medium heat. Sauté the finely chopped onion and garlic until translucent.
Add the tomato paste and stir well. Cook for a few minutes to allow the flavors to meld.
Pour in the red wine and simmer over medium heat for 10-15 minutes, or until the sauce has slightly thickened.
Add the cooked gnocchi to the sauce and gently toss to coat.
Before serving, sprinkle with freshly grated Parmesan cheese and chopped rosemary.
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