For the tomato sauce, peel and finely dice the onion and garlic. Heat 1 tablespoon of oil in a saucepan. Fry the garlic and onion for 2-3 minutes. Stir in tomato paste and sauté briefly. Add the tomatoes.
Season with salt, pepper and 1 pinch of sugar, bring to the boil and simmer for 15-20 minutes, stirring occasionally.
For the filling, wash, clean and coarsely grate the zucchini. Heat 2 tablespoons of oil in a frying pan. Sauté the zucchini for 3-4 minutes. Season with salt and pepper and remove. Stir cream cheese with milk until smooth.
Preheat oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer). Roll out the pasta dough. Spread cream cheese evenly on top. Sprinkle with zucchini. Roll up dough firmly from one long side.
Cut the roll into pieces about 5 cm wide. Approx. 2⁄3 Pour the tomato sauce into an ovenproof dish (approx. 20 cm Ø). Place the rolls upright in the sauce. Spread the rest of the sauce and the gorgonzola in pieces on top.
Bake in a hot oven for 20-30 minutes. Cover with foil if necessary so that the rolls do not get too dark. Remove and serve immediately.