Heat grill to high. Whisk together juices, oil, and chili powders in a medium baking dish. Add the halibut and turn to coat. Marinate for 5 minutes.
Remove the banana leaves from the water and shake off excess water. Place the leaves on a flat surface. Remove the halibut from the marinade, season with salt and pepper, and place 1 fillet in the center of each leaf. Wrap the banana leaf loosely around each fillet. Place the packets flat on the grill, close the cover, and cook for 8 to 10 minutes or until just cooked through. Carefully remove from the grill and serve the fish in the banana leaf, if desired. Serve fish with the Orange-Pineapple Relish.
Whisk together the lime juice, orange juice, chile de arbol, honey, and oil in a medium bowl. Add the remaining ingredients and stir to combine. Season with salt and pepper, to taste. Let sit at room temperature for at least 30 minutes before serving.
Recipe courtesy of Bobby Flay