Thaw fish, if frozen. Rinse fish; pat dry with paper towels. Cut fish into 4 serving-size pieces.
In a shallow bowl combine the flour, sesame seeds, and pepper. Transfer 2 tablespoons of the salad dressing to a small bowl. Brush all sides of the fish pieces with the 2 tablespoons salad dressing. Firmly press both sides of each fish piece into sesame mixture.