can you grill tuna on a plank
Sprinkle the tuna with salt; firmly press peppercorns into tuna. Place plank on grill rack over high heat; grill 5 minutes or until lightly charred. Carefully turn plank over; move to moderate heat. Place tuna on charred side of plank. Cover and grill 10 minutes or until desired degree of doneness. Serve tuna with orange mayonnaise.