In a large bowl, whisk the miso, sake, mirin, soy sauce, and sesame oil until combined. Add the halibut, turn to coat with the marinade, cover, and refrigerate for 30 minutes.
Position a rack 4 inches from the broiler element and heat the broiler to high. Line a heavy-duty rimmed baking sheet with foil and set a flat metal rack in (or over) the pan. Remove the fish from the marinade and arrange it on the rack, skinned side up. With a brush, generously dab and drizzle some of the marinade over the fish. Broil the fish until it’s brown in spots, 3 to 4 minutes. Gently flip it with a spatula and dab most or all of the remaining marinade on the second side. Broil until the fish is browned in spots, flaky, moist, and just cooked through (use the tip of a paring knife to check), 3 to 5 minutes more.
If you can’t find halibut, try substituting swordfish or mahi mahi.
Serve with a colorful vegetable stir-fry.
nutrition information (per serving):
Photo: Scott Phillips