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POUR marinade into large resealable plastic bag. Add steaks; turn to coat. Seal bag. Refrigerate 30 min. to marinate.
MEANWHILE, mix butter, cheese and onion until well blended; cover. Refrigerate until ready to use.
PREHEAT grill to medium heat. Remove steaks from marinade; discard marinade. Grill steaks, uncovered, 10 to 12 min. for medium-rare to medium doneness, turning occasionally. Remove steaks from grill. Remove bones; cut steak into thin slices. Top with the butter mixture.