Dinner · Part 3 of 3: Tips & recipe card

Miso Butter Seared Halibut with Mushrooms and Bok Choy Tips, FAQ & printable recipe

Name: Miso Butter Seared Halibut with Mushrooms and Bok Choy
Prep time: 15 min
Cook time: 12 min
Total time: 27 min
Cuisine: Japanese-American
Ingredients: 2 skinless halibut fillets, thick cut (about 6 oz each), scored diagonally; 1/2 tsp kosher salt, plus more to taste; black pepper, freshly ground, to taste; 6 fresh shiitake mushrooms, stems removed, caps left whole; 4 oz cremini mushrooms, sliced; 2 baby bok choy, halved lengthwise; 3 tbsp unsalted butter; 1 inch fresh ginger, peeled and grated on a fine box grater; 3 cloves garlic, thinly sliced; 2 tbsp white miso; 1 tbsp soy sauce; 2 tbsp mirin or water; 2 scallions, thinly sliced, for serving; 1 tbsp toasted sesame seeds, for serving

By Clara Weller · Nov 11, 2026

Plated miso glazed halibut topped with sliced scallions and toasted sesame seeds beside bok choy

Prep: 15 min
Cook: 12 min
Total: 27 min
Serves: 2

Tips for success

Dry the fish thoroughly before seasoning and searing. Surface moisture steams the fillet rather than browning it, and paper towels make the difference between a golden crust and a pale one. Pat the mushrooms and bok choy dry too, so the glaze clings to them rather than sliding off.

Keep the heat at medium once the fish is in the pan. High heat browns the surface too quickly and can scorch the miso and sugars in the glaze before the centre is cooked. If the glaze darkens faster than expected, lower the heat a notch and continue basting. This keeps the sauce glossy and caramelized rather than bitter.

Variations

Salmon version: Use skin-on salmon fillets in place of halibut. Score the skin, sear it skin side down until crisp, then flip and finish the glaze as in the main recipe. The richer fish stands up well to the same miso butter.
Cod and spinach: Swap the halibut for thick cod fillets and the bok choy for wilted spinach folded into the glaze at the end. The milder fish suits the soy and ginger, and the spinach cooks in under a minute.
Spicy miso butter: Add a pinch of red pepper flakes or a teaspoon of chili crisp to the butter with the ginger. The heat rounds out the sweetness of the mirin and gives the glaze a lively finish without changing the method.
Mushroom-only version: For a vegetarian dinner, replace the fish with thick slices of king oyster mushroom seared in the same garlic butter. Use vegetable broth or water in place of mirin and check that the miso and soy are labeled to suit your needs.

Storage and make-ahead

Fridge: Store cooked halibut in an airtight container in the refrigerator for up to 2 days, separate from the vegetables.
Freezer: Halibut does not freeze well after cooking because the texture becomes dry and flaky; freezing is not recommended for this dish.
Reheat: Reheat gently in a covered skillet over low heat for 3 to 4 minutes, until the fish is warmed through to 145°F (63°C).

Leftover halibut should cool for no more than 2 hours at room temperature before it goes into the refrigerator. Store the fish and the glazed mushrooms and bok choy in separate airtight containers, so the vegetables do not become soft and the fish keeps its texture.

Keep the cooked fish in the refrigerator for up to 2 days. Label the containers with the date, and reheat only the portion you plan to eat. Discard any leftovers that have been out of the refrigerator for more than 2 hours.

You can prepare most of this dish ahead, which makes the cooking itself quick. Grate the ginger, slice the garlic, cut the mushrooms and bok choy, and score the fish up to a few hours in advance.

Keep the fish covered and refrigerated until you start cooking, and store the vegetables in the refrigerator in separate containers.

Whisk the miso glaze and keep it in a sealed jar in the refrigerator for up to 24 hours. Let it come to room temperature for a few minutes before you use it, so it pours smoothly. Cook the fish fresh just before serving, since halibut is best seared and eaten immediately.

Serving ideas

Serve the halibut straight from the skillet on warm plates, with the glazed mushrooms and bok choy arranged underneath each fillet. Spoon any remaining pan glaze over the top so the sauce pools slightly around the fish. Add the scallions and toasted sesame seeds at the last moment so they stay bright and crunchy.

For a complete meal, pair the fish with steamed short-grain rice to soak up the glaze, or with a simple cucumber salad dressed with rice vinegar for contrast.

A light, dry white wine or a cold green tea goes well with the savory miso and ginger flavors. Keep the table setting simple so the golden fish and glossy vegetables remain the focus of the plate.

Frequently asked questions

Can this halibut be made with frozen fillets?

Yes, but thaw the fish completely in the refrigerator before cooking, which usually takes overnight. Pat the thawed fillets very dry, because excess moisture prevents a golden sear. Frozen fish that is not fully thawed will steam in the pan, release water into the glaze and cook unevenly. Check the thickest part with an instant-read thermometer and make sure it reaches 145°F (63°C) before serving.

What can you use instead of mirin?

Water is the simplest substitute and keeps the glaze savory rather than sweet. For a richer flavor, use a small splash of dry sherry, which adds depth and a similar gloss. Some cooks add a pinch of sugar to water to recover the sweetness that mirin gives. Taste the glaze before pouring it over the fish, and adjust the balance with more soy sauce or miso if it seems flat.

Why does the miso glaze sometimes burn?

Miso contains natural sugars that caramelize quickly over high heat, so a pan that is too hot can scorch the glaze before the fish is cooked. Keep the heat at medium once the glaze goes in, and spoon it over the fish continuously. If the sauce begins to darken faster than it bubbles, lower the heat or remove the pan briefly from the burner. A glossy, caramelized glaze should look brown, not black.

How do you tell when the halibut is cooked without cutting into it?

The fish is ready when the sides look opaque rather than translucent, and the flesh feels firm when you press the thickest part gently with tongs. An instant-read thermometer inserted into the centre should read 145°F (63°C). If you do need to check visually, insert a thin knife at the centre for a moment and look at the colour, but this releases some juices. Once the fish reaches temperature, remove it from the pan right away.

Can you cook the halibut in a nonstick pan instead of cast iron?

You can, but a cast iron skillet gives a stronger, more even sear because it holds heat well. A heavy stainless steel pan works too. Nonstick pans rarely brown the fish as deeply and can make it harder to build the glaze, since the sugars do not stick to the surface as they do in cast iron. Use a pan large enough to hold the fillets, mushrooms and bok choy in a single layer without crowding.

Recipe card

Miso Butter Seared Halibut with Mushrooms and Bok Choy

Prep 15 minCook 12 minTotal 27 minServes 2

Golden miso butter seared halibut fillet on glossy shiitake mushrooms and bok choy in a cast iron skillet

Ingredients

2 skinless halibut fillets, thick cut (about 6 oz each), scored diagonally
1/2 tsp kosher salt, plus more to taste
black pepper, freshly ground, to taste
6 fresh shiitake mushrooms, stems removed, caps left whole
4 oz cremini mushrooms, sliced
2 baby bok choy, halved lengthwise
3 tbsp unsalted butter
1 inch fresh ginger, peeled and grated on a fine box grater
3 cloves garlic, thinly sliced
2 tbsp white miso
1 tbsp soy sauce
2 tbsp mirin or water
2 scallions, thinly sliced, for serving
1 tbsp toasted sesame seeds, for serving

Instructions

Pat the halibut dry and cut shallow diagonal lines across the top of each fillet. Season both sides with the salt and black pepper. Keep the fish refrigerated until the pan is ready, and rinse nothing in the sink.
Grate the peeled ginger on a fine box grater set over the cutting board, so the pulp and juice fall onto the board. Thinly slice the garlic, slice the cremini, and halve the bok choy. Cut the scallions.
Set a 12-inch cast iron skillet over medium heat and add the butter. When it melts and foams, stir in the grated ginger with its juice and the sliced garlic. Cook until fragrant, about 1 minute.
Lay the halibut fillets in the garlic butter, scored side up, and arrange the whole shiitake mushrooms and sliced cremini around them. Sear without moving the fish until the edges turn golden, about 4 minutes.
Turn the fillets over and spoon the bubbling garlic butter over them. Whisk the white miso, soy sauce and mirin or water in a small bowl, then pour it into the pan. Add the bok choy, cut side down, and spoon the glaze over everything until it turns glossy.
Continue basting the fish for 2 to 3 minutes, until the thickest part is opaque and the flesh flakes easily with a fork. Check the centre with an instant-read thermometer.
Lift the halibut with tongs and set it over the glazed mushrooms and bok choy. Spoon the remaining pan glaze over the top, then scatter the sliced scallions and toasted sesame seeds before serving while hot.

Contains: fish, soy, milk, gluten, sesame, sulfites

Estimated nutrition per serving

Calories: 420
Protein: 36 g
Carbohydrates: 14 g
Fat: 24 g
Fiber: 3 g
Sugar: 5 g
Sodium: 1200 mg

Automatic estimate from the ingredient list, not laboratory-verified.

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This recipe is based on a short cooking video and is published under the pen name Clara Weller. It was checked before publication, but errors can slip through. Nutrition, when shown, is an estimate. Read more in our editorial policy and on our food safety page.