1. Bake fish according to package directions.
2. Meanwhile, make Sweet Pickle Mayonnaise by combining mayonnaise, sweet pickle relish, yellow mustard and a dash of hot sauce in a small bowl. Cover; refrigerate until needed.
3. Slather top and bottom of each bun with Sweet Pickle Mayonnaise.
4. Arrange baked fish fillets on bottom half of buns. Evenly top with lettuce and tomato and bun top.