Chipotle Tartar Sauce is an easy variation on classic tartar sauce and would also be tasty with French fries or crab cakes. Chipotle peppers (dried, smoked jalapeños) in adobo sauce add full, smoky flavor.
To make the tartar sauce, combine first 5 ingredients in a small bowl. Cover and chill 3 hours.
Sprinkle grouper with lemon pepper. Grill fillets, covered with grill lid, over medium-high heat (350° to 400°) 4 minutes on each side or until fish flakes with a fork. Place each fillet on a Kaiser roll. Top with Chipotle Tartar Sauce, tomato, onion, and cabbage.