1/2 cup Dijon mustard
1/4 cup honey
1 teaspoon Worcestershire sauce
1/4 teaspoon salt
1/8 teaspoon pepper
3/4 pound beef sirloin steak, cut into 1 inch cubes
In a bowl, combine the mustard, honey, Worcestershire sauce, salt and pepper. Pour half of the sauce into a large resealable plastic bag; add beef cubes and toss to coat. Set remaining sauce aside.
Thread beef onto metal or soaked wooden skewers. Discard marinade from beef. Grill, covered, over medium heat for 8-10 minutes or until meat reaches desired doneness, turning once. Serve with reserved sauce.