Soak the cedar plank you are going to use in water for at least 30-40 minutes before putting on the grill. (I weigh mine down with filled pans of water in the sink, then cover board completely with water). The wood plank needs to be soaked this long, so it doesn't catch fire on the grill. As the fish cooks, the cedar board smokes and infuses flavor into the seafood.
Once it is done "soaking", remove from water. Place a fresh salmon fillet on it SKIN SIDE DOWN. Use a pastry brush to spread melted butter all over the top of the salmon. Sprinkle with salt, pepper, and garlic powder. Squeeze some lemon juice over the top, also. Garnish the salmon fillet with thin slices of lemon.
Once BBQ is hot and ready, place wood plank directly onto BBQ rack. Cook salmon on medium heat (on our Weber grill we cooked it with lid closed, top vent open); if you are using a gas grill, be sure the flames are set low enough to not reach the cedar plank directly or you might catch it on fire! Cook salmon (with lid on BBQ) for about 35 minutes, until done and fish flakes easily.
Remove the entire plank from the BBQ, take it inside, and cut salmon (not the cutting board!) into serving pieces... serve, and enjoy!
Cedar Plank Grilled Salmon https://www.thegratefulgirlcooks.com/cedar-plank-grilled-salmon/