Mix ground beef, crumbs, salt,pepper,onion and 1/2 can tomato sauce.
Form into a loaf, wrap in foil and place in pan.
Bake at 350 for 50 minutes.
Mix the rest of the tomato sauce, brown sugar, vinegar, sugar and mustard in a sauce pan.
Bring to a boil.
Pour over meatloaf and bake 10 minutes more.
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