Slow Cooker Tomato Sauce

Place tomatoes, onion, garlic, and olive oil in a slow cooker. Season with oregano, basil, cayenne pepper, salt, black pepper, and cinnamon.
Cover, and cook 10 to 15 hours on Low. The longer you simmer it the more flavorful it becomes. At 10 hours it's really good, but at 15 its even better.