Meatballs

This is my husband's favorite. They sound weird but are really the best meatballs that I've ever had.

1 lb. hamburger
1 c. rice krispies
1 egg
salt
pepper
2 Tbsp. chopped onion
1/4 c. brown sugar
1/4 c. ketchup
1 tsp. mustard
2 Tbsp. vinegar

Mix hamburge, rice krispies,egg, salt, and pepper. Shape into balls and bake on a jelly roll pan at 350 for 1/2 hour. While baking, mix the rest of the ingredients and boil together. After balls are baked, put into baking dish. Pour the sauce over the top and bake for another 1/2 hour.