HEAT grill to medium-high heat.
MIX 1/4 cup honey and steak sauce; pour half over fish in shallow dish. Turn to coat both sides. Refrigerate 20 min. to marinate. Meanwhile, combine vegetables in large bowl. Mix dressing and remaining honey. Add to vegetable mixture; toss to coat. Spoon onto center of large sheet heavy-duty foil. Bring up foil sides. Double fold top and ends to seal packet, leaving room for heat circulation inside.
GRILL vegetable packet 20 min. Remove fish from marinade; discard marinade. Place fish, skin-side up, next to packet on grill; cook 5 min. Turn fish; brush with half the remaining steak sauce mixture. Grill 15 min. or until fish flakes easily with fork, brushing occasionally with remaining steak sauce mixture.
CUT slits in foil packet to release steam before opening packet. Sprinkle vegetables with parsley. Serve with fish.