- 3 tablespoons olive oil
- 2 onions, finely chopped
- 1 (28 ounce) can tomato puree
- 1/2 cup water
- 2 teaspoons dried oregano
- 1/2 teaspoon dried basil
- 1/2 teaspoon salt
- 1/4 teaspoon ground black pepper
- Heat olive oil in a saucepan over medium heat. Add onions; cook and stir until just starting to turn golden, 5 to 8 minutes. Stir in tomato puree, water, oregano, basil, salt, and pepper.
- Bring tomato sauce to a simmer. Reduce heat to medium-low; cover and simmer until flavors blend, about 30 minutes.