Preheat broiler. Melt butter in medium saucepan over medium heat; stir in
Worchestershire sauce, garlic salt, and mustard. Cook for 2 minutes,
stirring often; remove from heat. Brush onion halves with sauce and place
on broiler pan. Brush chicken with sauce and place, skin side up, on top
of onion halves. Arrange oven rack so that chicken is about 6 inches from
heat. Broil for 15 minutes; turn onion and chicken skin side down, leaving
onion on top. Brush liberally with sauce; broil for 15 minutes longer, or
until chicken is fork tender. Remove from oven. Serve hot sprinkled with
salt and pepper to taste.

Makes 5 servings.