1 1/2 lb. ground beef
1 tsp. salt
1/4 tsp. pepper
1 1/2 c. onion, chopped
2 tbsp. butter
2 tsp. horseradish (prepared)
2 tsp. mustard (prepared)
1/2 tsp. salt
6 split buns

Combine ground beef, salt and pepper. Shape into 12 thin patties. Brown chopped onion lightly in butter; add horseradish, mustard and salt. Spread onion mixture over 6 patties; top each with a patty and press together to form 6 large patties. Chill. Place patties on grill and brown each side 8 to 10 minutes. Serve on buns, if desired.

Makes 6 servings.