How to Make It
Saute onion and garlic in hot oil in a large skillet over medium heat 10 minutes or until tender.
Process tomatoes in a blender or food processor until smooth; stir into onion mixture. Add Italian seasoning, salt, and pepper; bring to a boil. Reduce heat, and simmer 1 hour, stirring occasionally; cool. Process in a blender, in batches, until smooth.