3 lb. ground beef
2 eggs
9 tbsp. prepared mustard
9 tbsp. ketchup
1/4 tsp. pepper
1 1/2 tsp. salt
1/4 lb. melted butter
2 med. onions, chopped

Mix all ingredients. (May be prepared ahead of serving time.) When ready to serve, spread on bun halves. Bringing mixture to end of bun. Put under broiler for a few minutes, until meat cooks and buns begin to brown.