Blackened Grouper Sandwiches with Rémoulade

Preheat broiler to high with oven rack 8 inches from the heat. Combine paprika, pepper, and salt in a small bowl. Rub spice mixture evenly over fillets. Heat oil in a large nonstick skillet over medium-high. Add fillets to pan; cook 3 to 4 minutes on each side. Combine mayonnaise, relish, mustard, and ketchup in a bowl. Arrange rolls, cut sides up, on a baking sheet; broil 1 minute or until toasted. Spread mayonnaise mixture over cut sides of rolls. Top bottom halves of rolls with lettuce, tomato, fillets, and top halves of rolls.