Instructions: Lightly score edges of steak at 1 inch intervals. 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 steak with butter mixture. Cook basting frequently with butter mixture, about 6 minutes per side for medium. Place steak on a serving platter. Cut thin slices across the grain. Drizzle reserved butter mixture over steak.

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