Apply kosher salt to skinless fish fillets, covering evenly and on both sides
Cover fillets with plastic wrap and refrigerate for 1 hour
Fire up smoker to 225°F (107°C). If using a charcoal grill, ensure you are set up for 2-zone indirect cooking.
While the smoker preheats, remove fish from the refrigerator. Use paper towels to wipe off excess salt.
Prepare the Paste: Peel and mince the garlic, and sprinkle with salt. Use a knife or spoon to press the salt into the garlic, crushing and combining to make a paste.
Transfer the paste to a small bowl and add the remaining ingredients: Olive oil, smoked paprika, chopped fresh thyme, white pepper, and cayenne pepper. Combine well.
Apply the paste to the fish fillets, spreading evenly on both sides
Apply a thin layer of oil to your smoker grates to help prevent the fish from sticking. Add wood chips to coals or wood tray.
Carefully place the fillets on the grates. Close your smoker’s door/lid and smoke at 225°F (107°C) until fish is flaky to the touch with a fork, approximately 20-30 minutes.
Remove from smoker and leave to rest for 5 minutes before serving