Wash tomatoes thoroughly
Bring a large pot to boil. Dunk the tomatoes in the boiling water to soften the skins - about 30-60 seconds
Remove the tomato skins. Dip the tomatoes in cold water can make this easier
Remove the cores and slice into quarters.
Boil the tomatoes for 20 minutes
Run the tomatoes through a food mill or strainer
Sautee garlic, onions, and green peppers
Combine cooked tomatoes and sauteed vegetables, spices and sugar in a large pot.
Simmer uncovered until the desired consistency is reached. Stir often.
Remove from heat and fill jars for canning. The sauce can also be frozen.