Boil potatoes and mash well.
Then add egg yolk, parmesan cheese, plain flour with boiled potatoes in a bowl and mix well.
Now make 4 rolls of this mixture and cut into slices and boil.
For Tomato Sauce: Heat olive oil in a pan, sauté garlic and add tomatoes and cook for few minutes.
Then sprinkle parsley, basil leaves, salt and black pepper and roast well.
Now serve with potato gnocchi.
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