Begin by rinsing the salmon fillet under cold water and patting it dry with paper towels. Remove any pin bones with tweezers.
In a mixing bowl, combine the coarse kosher salt, brown sugar, crushed black peppercorns, garlic powder, onion powder, and smoked paprika. This mixture will act as the dry brine for the salmon.
Place a layer of the dry brine mixture in a baking dish. Lay the salmon fillet on top, skin-side down. Cover the salmon with the remaining dry brine, ensuring it is fully coated.
Cover the baking dish with plastic wrap and refrigerate for 8-12 hours. This curing process will draw out moisture and infuse the salmon with flavor.
After curing, remove the salmon from the brine and rinse it thoroughly under cold water to remove excess salt and sugar. Pat the salmon dry with paper towels.
Place the salmon on a wire rack and allow it to air dry for 1-2 hours. This step is crucial for forming a pellicle, a slightly tacky surface that helps the smoke adhere to the fish.
While the salmon is drying, prepare your smoker or grill. Soak the wood chips in water for at least 30 minutes, then drain them.
Set your smoker to a low temperature, around 150-160°F (65-71°C). If using a grill, set it up for indirect cooking and maintain a low temperature.
Place the salmon fillet on the smoker rack, skin-side down. Add the soaked wood chips to the smoker or a foil packet on the grill.
Smoke the salmon for 2-3 hours, or until it reaches an internal temperature of 145°F (63°C) and flakes easily with a fork.
During smoking, check the temperature occasionally to ensure it remains consistent.
Once the salmon is smoked, remove it from the smoker and let it cool to room temperature.
For best results, wrap the smoked salmon in aluminum foil and refrigerate for a few hours before serving. This resting period allows the flavors to fully develop.