We like to make this with local wild trout caught by our fisherman friend Raymond Holmes. You can get good results, though, with farm-raised trout from the supermarket.
About 2 hours before you plan to smoke the trout, combine the dressing ingredients in a blender and puree until smooth.
Place the trout, lying open, in a shallow, nonreactive dish. Drizzle each fish with about 1 tablespoon of the dressing. Cover the trout and refrigerate for about 1½ hours.
Prepare your smoker for barbecuing, bringing the temperature