Step 1

For the lionfish: Preheat a grill or grill pan. Place 2 lionfish fillets each into the center of two 10-by-10-inch aluminum foil squares. Combine the garlic salt, oregano, paprika, cayenne and black pepper in a small bowl, and then coat both sides of the fillets with the spice mix. Top the fillets with the butter cubes, and then tightly wrap the foil squares to form 2 pockets. Place the pockets on the grill and cook until the fish is tender and flakey, about 6 minutes.

Step 2

For the potato salad: Combine the celery, eggs, potatoes and onions in a large mixing bowl. Mix together the mayonnaise, relish, mustard, vinegar, dill weed, black pepper, lemon juice and salt in a separate bowl, and then pour over the potatoes and toss to combine. Taste and adjust the seasoning, if necessary.

Step 3

To serve, transfer the fish to plates, drizzling the melted butter on top. Scoop some potato salad alongside and enjoy.