1. Preheat broiler.
2. Combine the first 6 ingredients in a shallow dish. Coat both sides of fish with cooking spray. Dredge fish in cornmeal mixture.
3. Place fish on a broiler pan coated with cooking spray. Broil 10 minutes or until fish flakes easily with a fork or until desired degree of doneness.
4. Combine butter, rind, and juice in a small bowl; stir well.
5. Spread 1 1/2 teaspoons butter mixture over cut side of each of 4 roll tops. Place 1 fillet, 1 tomato slice, and 1/4 cup lettuce on each of 4 roll bottoms. Place top halves of rolls on sandwiches.