Heat oil in a large saucepan over medium heat. Add onion to pan; cook 4 minutes or until tender. Add garlic; cook 1 minute. Add tomato; cook 4 minutes. Stir in sugar and next 6 ingredients (through cloves) and 1/4 teaspoon salt; bring to a boil. Reduce heat, and simmer until mixture thickens and is reduced to 2 1/2 cups (about 65 minutes). Stir in the remaining 1/4 teaspoon salt and black pepper.