Brush steaks with Worcestershire sauce; sprinkle with pepper. Cover and grill steaks until desired doneness. Mix remaining ingredients (about 1/3 cup horseradish and 1 teaspoon mustard to 2/3 cup sour cream). Serve with steaks.
<B>Steak Grilling Guide</B><BR><BR>
Cover and grill steaks 2 to 4 inches from medium heat about 12 minutes for medium, turning once halfway through cooking, until desired doneness.