Can be prepared in 45 minutes or less.
1/4 cup regular or reduced-calorie mayonnaise
4 kaiser rolls, cut in half
Preheat broiler. Season halibut with salt and pepper. Broil until just cooked through, about 3 minutes per side. Transfer to plate; cool 10 minutes. Break halibut into small pieces.
Combine mayonnaise and next 5 ingredients in medium bowl and stir to blend. Mix in halibut. Season salad to taste with salt and pepper. (Can be made 6 hours ahead. Cover and refrigerate.)
Arrange bottoms of rolls on plates. Mound salad over, dividing evenly. Top with lettuce, then with tops of rolls. Press sandwiches lightly to compact.