2 1/2 lb. sirloin steak (1 1/2-inches thick)
1/2 c. butter
1/4 c. chopped, fresh parsley or 4 tsp. dried parsley
1/4 c. minced onion
2 tbsp. Worcestershire sauce
1 tsp. ground pepper
1/2 tsp. dry mustard

Lightly score edges of steak. Preheat grill or broiler. Combine butter, parsley, onion, Worcestershire sauce, pepper and mustard in a small saucepan; heat, stirring continually, over low heat until butter melts. Reserve 1/4 of the mixture. Place steak on grill or broiler pan. Brush with butter mixture. Cook, basting frequently with mixture, about 6 minutes per side for medium steak. Place steak on a serving platter. Cut thin slices across the grain. Baste reserved butter mixture over steak.

Serves 6.