Starting with a filet of salmon that is 2 to 3 lbs. with skin, I oil both sides ( olive oil) and then lightly sprinkle thyme on both sides and put in on a dish.
This was done while the cedar plank (purchased at any market) is soaking in water for about 45 minutes. After I heat the grill on high temp setting I put the plank on the grill for about 3 minutes to sear it, before I put the fish (skin-side against the wood) on the heated side of the plank. With salmon now on the plank I add a few slices of lemon right down the center of the filet.
Put the plank with salmon on the grill (high) and close the cover of the grill for about 25 minutes.
Every 8 minutes I check it to make sure the board hasn’t gone up in flames, and if it starts to burn I use a spray bottle of water to douse the flames.
That also promotes smoking which really adds to the flavor of the fish.