IMMERSE plank in water, placing a weight on top of plank to keep it submerged. Soak at least 4 hours or overnight.
PREHEAT barbecue to medium heat. Mix dressing, parsley and tomatoes; set aside. Brush top of cedar plank with 1 Tbsp. oil; top with fish. Place on barbecue; cover barbecue with lid.
GRILL 10 min. Brush with dressing mixture; continue grilling 10 min. or until fish flakes easily with fork.