World s Best Marinara

1 tablespoon olive oil

1 sweet onion, diced

4 cloves garlic, minced

1 (8 ounce) package fresh mushrooms, chopped

1 red bell pepper, diced

1 cup fresh flat-leaf parsley, torn

2 tablespoons oregano

2 tablespoons white sugar

2 teaspoons dried basil

1 teaspoon dried rosemary

½ teaspoon dried sage

½ teaspoon red pepper flakes

½ teaspoon salt

ground black pepper to taste

1 (28 ounce) can tomato sauce

Heat olive oil in a saucepan over medium heat; cook and stir onion and garlic until fragrant, about 2 minutes. Add mushrooms, red bell pepper, and parsley; cook and stir until mushrooms are slightly softened, about 2 minutes. Add oregano, sugar, basil, rosemary, sage, red pepper flakes, salt, and black pepper; stir to combine, 2 minutes.

Stir tomato sauce into seasoned onion-mushroom mixture; cook over low heat until flavors have combined, 30 minutes.

Transfer half the sauce to a blender; blend until smooth. Return to saucepan with the remaining sauce; stir to combine.