Sugo con zucchini (per la pasta)

Ingredients for 4 persons:
  -  2/3 of an onion
  -  500 gr of pasta
  -  1 clove garlic
  -  1 carrot
  -  1 stick of celery
  -  4 zucchini (courgettes)
  -  2 cans of peeled tomatoes
  -  olive oil
  -  salt/pepper

Recipe: cut the carrots, celery and onion into small pieces. Slightly fry
them in olive oil. Then add the zucchini, cut in medium-sized pieces. Before
the onion turns red, add the tomatoes and let it boil slowly for (at
least) 20 min. Keep stirring. Add salt and pepper to your taste. If the
sauce is too acid, you can add a small amount of milk. Serve with (lots
of) boiled pasta.
