In a large, heavy pot, heat oil over medium-low heat. Add onions and cook, stirring frequently, for 5–7 minutes or until soft and translucent. Add garlic and cook, stirring for 2 minutes. Add tomatoes and vinegar, increase heat, and bring to a boil. Reduce heat and simmer, uncovered, stirring occasionally for 60–70 minutes or until thick and reduced by about half.
Meanwhile, heat three 2-cup jars and lids.
Working in batches, purée tomato mixture in a food processor. Return to pot and bring to a boil. Reduce heat and simmer, stirring occasionally, for 30 minutes or until thick. Add basil, oregano, lemon juice, and salt.
Fill hot jars, leaving 1/2-inch headspace. Top with lids. Process jars at a full boil for 30 minutes.
Recipe Notes
Nutrition Facts
Heirloom Tomato Sauce
Amount Per Serving
Calories 56Calories from Fat 18
% Daily Value*
Total Fat 2g3%
Polyunsaturated Fat 1g
Monounsaturated Fat 1g
Sodium 204mg9%
Total Carbohydrates 10g3%
Dietary Fiber 3g12%
Protein 2g4%
* Percent Daily Values are based on a 2000 calorie diet.