Working in batches, combine the slightly cooled tomatoes and their juice in a blender along with the sautéed onion and garlic, tomato paste, and the seasonings. Purée until mixture is very smooth. Once puréed, give the entire sauce a good stir to ensure all ingredients are well mixed and blended. Pass the puréed mixture through a fine mesh sieve for a smoother sauce. If desired, stir in 1/3 cup finely grated Parmesan cheese. Use on pizzas immediately or freeze in airtight freezer container(s) for longer storage.
NOTE: If you prefer to use fresh chopped herbs instead of dried, a general rule of thumb is that 1 tablespoon of fresh chopped herbs equals 1 teaspoon dried. This, however, is just a “general” guideline. The amount of seasonings added should be according to personal taste preference.
Yield: Approximately 1 2/3 cups