Immerse an untreated, 20-inch cedar plank suitable for cooking use in water; soak at least 1 hour or up to 1 day. Place salmon fillet, skin side down, on soaked plank. Sprinkle with lemon zest, dill, salt, and pepper.
Place planked salmon in centre of cooking grate. Grill 25 to 30 minutes or until salmon is opaque in centre and flesh flakes easily with a fork. Garnish with lemon wedges.
Makes 4 to 6 servings.