Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   3      cups          water
   1      cup           soy sauce
     1/3  cup           brown sugar
     1/3  cup           white sugar
     1/3  cup           kosher salt
     1/2  teaspoon      onion powder
     1/2  teaspoon      garlic powder
     1/2  teaspoon      pepper

Preparation:

Stir until ingredients are dissolved. Marinate fillets overnight. Air dry fillets and smoke as usual.