Miso Butter Seared Halibut with Shiitake and Bok Choy in One Pan

Two thick halibut fillets hit a foaming cast-iron skillet, and within minutes the edges turn opaque and golden. A spoonful of miso butter, a little grated garlic and caramelized shiitake turn this simple dinner into something worth sitting down for. It comes together in one pan, with almost no cleanup.

This miso butter seared halibut is a one-pan dinner built on contrast. The fish gets a crisp, golden bottom from hot butter, while the miso and garlic melt into a glossy sauce that coats every flake. Shiitake mushrooms and baby bok choy cook in the same skillet, soaking up the buttery sauce and browning at the edges.

Scallions and toasted sesame seeds add freshness and crunch right before serving. The method is short and direct: score the fish, sear it in foaming butter, baste it, then plate it over the pan sauce. Plan to serve it right away, while the fish is still moist and the sauce is at its shiniest.

Ingredients

Why this recipe works

Scoring the halibut shortens the path the heat takes through the thick fillet and gives the sauce small channels to cling to. Searing the fish in hot, foaming butter creates a golden crust fast enough that the flesh stays tender and flaky instead of drying out.

Basting is what makes this method work. Tilting the pan pools the bubbling butter, and spooning it over the fish cooks the top of the fillet gently while the bottom browns.

The miso and grated garlic stirred into that butter form an emulsified pan sauce that clings to the halibut and the mushrooms, so every bite carries the same savory, buttery flavor.

Notes and substitutions

Halibut is the classic choice for this dish because its thick, firm flakes hold together through searing and basting. Buy fillets of even thickness so they cook at the same rate, and ask the fishmonger for center-cut pieces if you can.

Fresh garlic matters here: grate it finely so it dissolves into the sauce rather than leaving harsh bites. Use white miso for a mild, slightly sweet sauce. Red miso works too, but it is saltier and more intense, so taste before adding extra salt.

A 10- to 12-inch cast-iron skillet is the best tool because it holds heat evenly and gives the fish a deep crust. A microplane-style grater produces the fine garlic shreds that melt into the butter.

You will also need a sharp knife for scoring, a cutting board, tongs and a thin fish spatula for lifting the delicate fillets. Any heavy skillet can stand in for cast iron, though it may brown the bottoms a little less evenly.

• Halibut: Cod or sea bass fillets of similar thickness; cook time may shift slightly.
• White miso paste: Red miso paste, which gives a deeper, saltier sauce; reduce or skip the added salt.
• Shiitake mushrooms: Cremini mushrooms, sliced in half if large.
• Baby bok choy: Napa cabbage leaves or baby spinach stirred in at the end.

Equipment

• Cast-iron skillet
• Cutting board
• Sharp knife
• Microplane-style grater
• Tongs
• Fish spatula