1/3 c Finely chopped onion 1/3 c Finely chopped carrot 1/3 c Finely chopped celery 1/3 c Olive oil 2 t Salt pn Sugar 2 c Canned tomatoes with juice, -roughly chopped 8 oz Mozzarella cheese, grated -(about 2 cups) 1 1/2 c Very thinly sliced red onion FOR THE SAUCE: Saute the vegetables in oil about 5 minutes. Add salt, sugar and tomatoes. Simmer 45 minutes, stirring occasionally. Put a pizza stone on the lowest oven rack. PReheat to 400'F. (To use a metal pizza pan instead, do not preheat the pan.) Spread 1/4 cup sauce over 2 12" pizza shells to within 1/4" of edge (reserving the rest of the sauce for another purpose). Sprinkle with the cheese and top with the onion. Bake 15 minutes, or till the crust is golden brown. MAKES 2 MEDIUM PIZZAS, 8 SLICES EACH. Per slice: 171 calories, 21 grams carbohydrates, 6 grams protein, 1 gram fiber, 6.7 grams fat (2 grams saturated), 270 milligrams sodium.