PREHEAT grill to medium-high heat. Cook corn in dry skillet on medium-high heat 3 to 5 min. or until golden brown and roasted; cool slightly.
COMBINE corn, onion, tomato, cilantro and crushed red pepper in bowl. Mix lime juice, mustard and sugar; stir into corn mixture. Set aside.
PLACE ham steak on grill; brush with barbecue sauce. Grill 7 to 9 min., turning once. Serve with roasted corn relish.