Peel onion and garlic. Dice the onion, cut the garlic into slices. Cut the stalk from the tomatoes. Add boiling water to the tomatoes, rinse and peel the skin. Cut the tomatoes into 6 slices each.
Heat 1 tablespoon of oil in a saucepan. Fry the tomatoes, garlic and onion for about 4 minutes. Add tomato paste and steam briefly. Deglaze with wine and boil down for about 10 minutes until creamy.
Cook the pasta in plenty of boiling salted water according to package instructions.
Wash the tuna, dab dry and cut into cubes of about 3 cm. Heat 1 tablespoon of oil in a coated frying pan. Fry the tuna on all sides at medium heat. Season with salt and pepper and add to the tomato sauce.
Simmer over a low heat for about 5 minutes.
Wash the herbs and shake dry. Set aside 1 stalk of mint. Chop the remaining herbs coarsely and stir into the tomato sauce. Season with salt, pepper, lemon juice and sugar. Drain the pasta.
Mix with sauce, arrange and garnish with mint.