Cedar Plank Cooking.We use cedar planks for cooking salmon, but not in the smoker. The planks are soaked for a few hours and the fish (usually) is placed on the planks then into the oven or grilled indirectly. The steam from the wood gives a subtle flavor, but the wood should only be lightly toasted not burned at all. Cedar when burned leaves a lot of resin on everything and pops embers everywhere. If you are looking for that kind of flavor try alder in the smoker. Works every time for me and I have switched to it almost entirely.