1. Heat olive oil in a dutch oven over medium high heat. Saute' onions 5 minutes until soft and translucent. 2. Add sugar, garlic, tomato paste and seasonings. Saute' one minute more. 3. Stir in vinegar, cook 30 seconds. Add broth and tomatoes. Bring to a boil, reduce heat to low and simmer about 40 minutes until sauce is thick and quite fragrant.