Forethought: Use as much fish as you would like, I use nearly 4 lbs because it is a long process and I like to get as much out of my time as I can. Keep skin intact on the fish.
Making the brine: Add the brown sugar, kosher salt and water to a pot and boil until everything is completely dissolved. Allow to cool completely. Add the fish and place in the refrigerator for 12 hours.
Prepare your smoker to 200-225°F with charcoal and dampened wood chips.
Remove the fish, rinse and pat dry. Add the your smoker skin side down.
Optional: baste the top of the fish throughout the cooking process with maple syrup or spicy pepper sauce or a mixture of both.
Remove when the internal temperature has reached approximately 140°F. If you don’t have an internal temperature reading you can alway break open the center of one fillet to check it around 3 hours and sample it to tell if it is done.