Preheat the grill, setting the burners to medium. Place the plank on the grill and heat for 10 minutes or until the wood is well marked. Flip the plank over and place the shrimp on it. Close the lid and cook for 8 to 10 minutes or until cooked through. Sprinkle with chives and serve with grilled lime wedges. Serve as an hors d’oeuvres.