Peel and chop the onion. Wash and chop the basil.
Cook the pasta in boiling salted water for about 10 minutes
Fry the onion in hot oil. Add cream and half of the basil. Simmer for 4-5 minutes. Stir in cheese and rest of basil, season to taste. Wash and chop the tomato. Drain the pasta. Serve everything
Drink: cool white wine