1 lb. ground chuck
Sliced onions
1 c. ketchup
1/2 c. water
2 tbsp. Worcestershire sauce
2 tbsp. brown sugar
2 tsp. vinegar

Pat meat into burgers and brown lightly. Arrange in baking dish. Top each burger with sliced onion. Combine ketchup, water, Worcestershire sauce, brown sugar and vinegar and pour over burgers. Bake at 350 degrees for 1 hour.