Fry the onions in oil until translucent, add tomato paste and roast briefly, add a little sugar, then garlic and the chopped tomatoes (none passed, it should be pieces). Pour in some vegetable stock, put a lid on and let the sauce simmer briefly. Add the tuna, if you like with the water, heat it in the sauce. Stir processed cheese, sour cream and basil into the sauce and season with black pepper, add a little salt if necessary.
Mix the pasta with the sauce and feast.
The portion then has 7.5 points per person for 2 people and if you want the whole sauce to yourself, then it is 11 points, which is also possible.
You can vary how much you like with cheese and sour cream, counting 0.5 P per tablespoon.