Castellan Pasta With Shrimp

Ingredients 1/4 cups extra virgin olive oil. 1 medium onion, chopped (white or yellow). 3 cloves garlic (finely chopped). 1 lb. medium shrimp, peeled. 1 can of 28 oz. Tomato (tomato) skinless whole. 3 sprigs of fresh basil. Salt and pepper to taste. 14 ounces uncooked spaghetti. 2 tablespoon unsalted margarine diced. 1/3 cup grated…