In a saucepan heat oil. Add onion and saute until transparent. Then add garlic, tomatoes with their juices, salt, hot pepper, and pinch of sugar. Cook, uncovered, for 20 minutes. Season to taste, and puree in a food mill. Return to the saucepan, add meatballs to reheat them slightly and serve atop your spaghetti.
Recipe courtesy of Michele Urvater