Place oil in heavy-bottomed saucepan set over medium heat. Stir in onion and garlic and cook until softened, about 5 min. Add can of diced tomatoes, tomato paste, sugar, vinegar, salt, pepper, oregano, cumin and cloves; bring to a low simmer (small bubbles should just break the surface). Cook uncovered, stirring occasionally, about 30 min. until thickened. Stir frequently near end of cooking to avoid burning mixture.
Transfer mixture into food processor or blender and puree until smooth. Pour ketchup into heatproof glass jar; cool to room temperature. Seal with lid and chill at least an hour. before using. Ketchup can be stored in refrigerator up to two weeks.
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