Tomato Sauce with Olive Oil and Chopped Vegetables

Put the tomatoes, carrot, celery, onion, and salt in a saucepan. Simmer uncovered at a slow, steady simmer for 30 minutes, stirring from time to time.

Add the olive oil and raise the heat slightly so the sauce simmers more strongly. Stir occasionally while pressing the tomatoes down with the back of the spoon to reduce them to a thicker pulp. Cook 15 minutes, then taste and correct for salt.