- 2 tablespoons olive oil
- 1 small onion, diced
- 2 garlic cloves, minced
- 1 (32 ounce) can diced tomatoes
- 1 large carrot, finely shredded
- 1 stalk celery, diced
- 2 teaspoons Italian seasoning
- 1 teaspoon dried oregano
- 1/2 teaspoon salt
- 1/8 teaspoon ground black pepper
- 1 bay leaf
- Heat olive oil in a saucepan over medium-low heat. Cook and stir onion in the hot oil until translucent, about 10 minutes. Add garlic; cook and stir until fragrant, about 30 seconds.
- Stir diced tomatoes, carrot, celery, Italian seasoning, oregano, salt, pepper, and bay leaf into the saucepan. Simmer until flavors combine, about 1 hour.
- Pour sauce into a food processor, discarding bay leaf. Cover and blend carefully until smooth.