Papa John s Sauce

2 teaspoons olive oil, or as needed

1 sweet onion, diced

6 cloves garlic, minced

6 (28 ounce) cans Italian-style peeled tomatoes (such as Cento® San Marzano)

2 tablespoons chopped fresh oregano

1 tablespoon salt, or to taste

1 tablespoon ground black pepper, or to taste

10 leaves fresh basil

Pour just enough olive oil into a large pot to coat the bottom; place over medium heat. Cook and stir sweet onion in the pot until it releases some moisture, 1 to 2 minutes. Stir garlic with the onion; cook another 1 minute. Remove pot from heat immediately.

Process the tomatoes in a large food mill using medium holes; grind directly into the pot. Bring the tomato mixture to a light simmer over medium-low heat; season with oregano, salt, and pepper. Allow the mixture to simmer 1 hour, stirring regularly.

Stir basil leaves into the sauce. Simmer 1 hour more, again stirring regularly.