1 lb Lean Hamburger
1 ea Small Onion, Chopped
1 ea Slice Bread, Cubed
2 T Catsup
1/2 t Salt
1 1/2 t Prepared Mustard
1 t Worcestershire Sauce
1 t Prepared Horseradish
Mix all ingredients. Shape into 4 patties, about 3 1/2 inches in diameter. Place in square baking dish 8 x 8 x 2-inches. If desired, brush each patty with additonal catsup. Cover loosely and microwave on high (100%) 5 minutes; turn dish one-quarter turn. Microwave until done, 2 to 3 minutes.