Basic Tomato Sauce with Onion and Garlic

Name: Basic Tomato Sauce with Onion and Garlic
Ingredients: 1 tablespoon extra-virgin olive oil; 1 medium onion finely chopped; 4 cloves garlic minced; 2 28-ounce cans diced tomatoes or 3 1/2 pounds fresh tomatoes peeled, seeded and diced; 1 tablespoon tomato paste; 1 teaspoon dried oregano; Pinch of crushed red pepper; Freshly ground pepper to taste