Peel the potatoes, cut them into smaller pieces, and cook in salted water for about 20 minutes, or until tender.
Drain the cooked potatoes, mash them in a bowl, and let them cool completely.
To the cooled potatoes, add the flour, egg yolk, and a pinch of salt. Knead until you have a soft, smooth dough.
Divide the dough into four parts. Roll each part into a rope about 2 cm thick, then cut into small pieces. Gently press each piece with a fork to create the characteristic gnocchi ridges.
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. Add the finely chopped onion and garlic. Sauté for 2-3 minutes, until softened.
Add the mixed seafood to the skillet and sauté for 3-4 minutes, allowing the flavors to develop.
Pour in the white wine and cook over medium heat for 5 minutes, allowing the alcohol to evaporate.
Add the tomato paste and heavy cream, then mix thoroughly. Cook for another 5-7 minutes, until the sauce thickens slightly.
Add the cooked gnocchi to the sauce and gently toss to coat evenly.
Before serving, sprinkle with fresh parsley and freshly ground black pepper.
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