Smoked Salmon Salad Sandwich

Heat oven to 450° F. Roast the salmon fillet on a rimmed baking sheet until cooked through, 6 to 8 minutes; let cool, then flake.

Combine the smoked salmon, mayonnaise, celery, chives, capers, lemon zest, flaked salmon, and ¼ teaspoon pepper in a medium bowl.

Divide the salmon salad and lettuce leaves among the bread.