In a large pot heat oil and cook onion & garlic until onion is tender. Stir in remaining ingredients and heat to boiling. Then reduce heat to low. Cover and simmer 30 minutes, stirring occasionally. Add meatballs to sauce; cover & simmer 15 minutes.
Recipe by The Little Things Journal at https://thelittlethingsjournal.com/2010/06/21/spaghetti-meatballs/