Process tomatoes and their juice in food mill or a hand blender. Mix them up and DON'T make them completely smooth. Make it about 1/16 of an inch. Then set them aside.

Combine butter and oil in sauce pan and turn the stove on medium to low heat. Once butter is melted, add red pepper, garlic, oregano, a large pinch of salt and continue stirring until fragrant but not browned. (About 3 minutes) After that, add in basil springs, tomatoes, sugar, and onion halves. Make it simmer, turn heat down to lowest setting,(bubbles should barely be popping) and cook stirring frequently until either sort of thick or just 1/2 to about an hour. Through out basil springs and onions. Add salt for taste. If you want, you can just allow it to cool and then cover it up and put it in the fridge.