Breaded Fish Sandwiches

In a shallow bowl, combine the first five ingredients. Coat fillets with bread crumb mixture. Using long-handled tongs, dip a paper towel in cooking oil and lightly coat the grill rack. Grill halibut, covered, over medium heat or broil 4 in. from the heat for 4-5 minutes on each side or until fish flakes easily with a fork. Grill buns, cut side down, over medium heat for 30-60 seconds or until toasted. Meanwhile, in a small bowl, combine the lettuce, carrots and onion if desired; set aside. In another small bowl, combine the sauce ingredients; spread over bun bottoms. Top with halibut and vegetable mixture; replace bun tops.