1. Preheat broiler.
2. Combine 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 desired degree of doneness.
4. Combine butter, rind, and juice in a small bowl; stir well.
5. Spread 1 teaspoon butter mixture over cut side of each of 4 bread tops. Place 1/4 cup lettuce, 2 tomato slices, and 1 fillet on each of 4 roll bottoms. Place top halves of rolls on sandwiches.