Halibut with Balsamic Glaze
Whisk balsamic reduction, oil, and garlic in a bowl. Arrange halibuts in an 8-inch square baking dish. Pour marinade over the fish, coating it completely. Cover and refrigerate at least 30 minutes and up to 4 hours.
Preheat the broiler. Line the bottom and sides of a baking sheet with foil. Spray the foil with nonstick cooking spray. Remove fish from marinade, reserving marinade, and arrange the fillets atop the baking sheet. Pour the marinade into a heavy small saucepan. Broil the fillets until they are just cooked through and caramelized on top, about 12 minutes.
Bring the marinade to a boil, about 5 minutes. Spoon off any excess oil from the sauce, if desired. Transfer the fillets to plates. Spoon the sauce over and around the fillets, and serve.