Heat the oil in a medium saucepan over medium-high heat. Add the onion and cook, stirring, until lightly browned, about 4 minutes. Add the garlic and crushed pepper and cook, stirring frequently, until fragrant, about 45 seconds. Add the tomato paste and cook, stirring, until lightly browned, about 1 minute more. Add the tomatoes, vinegar, sugar, and salt and bring to a boil. Lower the heat, and simmer, uncovered, stirring occasionally, until deep red in color and reduced to about 4 cups, about 25 minutes. Season with pepper to taste. Use now, or store, covered in the refrigerator for up to 3 days or freeze for up to 1 month.
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From Food Network Kitchens