Family Tested & Approved
Preheat oven to 350 degrees.
Mix together the beef, breadcrumbs, onion, egg, salt, pepper, and 1/2 cup of the tomato sauce
Form this mixture into a loaf and place it in a shallow pan
Stir together the remaining tomato sauce, vinegar, sugar, mustard, Worcestershire
Pour this sauce over the meatloaf
Bake for 1 hour, basting every 15 minutes with the pan juices.