Soak the cedar plank in water for 20 minutes, keeping it immersed.
Prepare your wood-fired oven until you have low embers around 350°F. The embers should not have flames.
Stir together the oil, butter, maple syrup, garlic, lime & lemon juice and dill. Spread mixture on the flesh side of the salmon and let it stand at room temperature 5 minutes.
Place the salmon gently on the cedar plank, skin side down and roast at 350°F until the salmon is just cooked through and the edges are browned, it takes about 10 minutes but keeps an eye on it as it might be different.
Remove the salmon planks from the Wood fired oven. The internal temperature of the salmon should be about 140°F. Make sure to use a pizza peel as the plank will be very hot. Let rest 5 minutes before serving.
Garnish it with fresh dill and top with sea salt. Serve with some roasted veggies.