I had this at a local restaurant and it is seriously the best salmon I have ever had. I asked them for the recipe and but they wouldn't give it out. This is my recreation and I think it's better than theirs!
Soak cedar plank in water for at least four hours. Heat grill on high and place plank on grill until dries out, should not take more than 3 minutes, then turn grill down to low.
Combine all sauce ingredients in small bowl. Adjust to taste, adding more sugar gives a nice caramelized crust.
Rinse salmon and pat dry. Coat top with sauce. Place on cedar plank and cook with grill hood down for about 20 minutes on low. Make sure cedar does not catch on fire. Salmon will flake with fork when done.