Heat the oil in a deep, heavy saucepan. Add the onion and celery and sauté over moderate heat until they are golden. Stir in the crushed tomatoes, sugar, and seasonings.
Bring to a simmer, then stir in the beans. Add a pinch of salt and a grinding of pepper. Simmer, covered, over very low heat for 45 minutes. Taste to adjust seasonings and serve hot. Makes 6 Servings.