Pasta salad with tomato and mozzarella and basil

Pasta in abundant boiling salted water and Cook 10 minutes. Put off and allow to cool.
Peel the onion and dice finely. 6 Tablespoons and stir vinegar, salt, pepper and sugar. Oil below suggest. Mix marinade and pasta.
Drain the mozzarella. Wash the tomatoes and basil. Aside some Basil for garnish, cut the rest into strips. Tomatoes cut in half. Mix with the pasta and again to taste.