1Combine oil, onions and garlic in a large pot or Dutch oven. Cook on medium heat until onions are soft, stirring occasionally to keep from sticking. Add rest of the ingredients and bring to a boil over medium-high heat, stirring frequent to keep from sticking. Once it starts boiling, turn heat to low simmer and simmer for 2 hours or until sauce reaches consistency.
2Take pot off stove and using a immerse blender, blend until coarse smooth. Replace back to heat, and returning to medium heat. Process (canning) in hot jars and lids for storing. Or, pour over 3 to 4 pounds of spaghetti.