Peel and cut the onion and the garlic in small pieces.
Cut the tomatoes in small pieces.
Fry the onion and garlic in a frying pan in the olive oil, until it is soft.
Add the tomatoes, the bouillon and the basil in the frying pan, and lower the heat of the pan. Continue to boil the tomato sauce for approx 15 minutes on low temperature.
While the sauce is boiling, prepare the pasta according to the instructions on the package.
Make sure the sauce is not burning in the frying pan, stir it from time to time.
When the pasta is ready, pour away the water and add the sauce in the casserole, and stir it together.