Catfish Hero with Seared Tomatoes and Herbed Mayo

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Cooking spray

4 Roma tomatoes, sliced into 1/4-inch thick rounds

Salt and freshly ground black pepper

1/2 cup mayonnaise

2 tablespoons chopped fresh basil

1 tablespoon chopped fresh chives

2 teaspoons Dijon mustard

1 teaspoon finely grated lemon zest

4 long sandwich rolls

Cooked catfish fillets, about 12 ounces total

Lettuce leaves

Thinly sliced red onion