Sablefish in Sake Kasu

Ingredients

Equipment Needed

• •Glass or ceramic baking dish
• •Sheet pan
• •Aluminum foil
• •Instant-read thermometer
• •Fish tweezers or needle-nose pliers

Instructions

1. 1

   Make the marinade

   Combine the sake kasu, white miso, mirin, sugar, and sake in a medium bowl. Work the mixture with a rubber spatula until completely smooth. The sake kasu can be stubborn, almost like stiff clay when cold, so give it time to incorporate. You're looking for a paste the consistency of thick peanut butter, pale and uniform without lumps. Taste it. The sweetness should balance the salty funk of the miso.

   If your sake kasu is very firm, let it sit at room temperature for an hour before mixing, or warm it briefly in the microwave to soften.
2. 2

   Prepare the fish

   Pat the sablefish fillets thoroughly dry with paper towels. Run your fingers along the flesh side to check for any remaining pin bones; remove them with tweezers or needle-nose pliers. The flesh should feel almost waxy, dense with fat. This richness is why sablefish takes so beautifully to marination. Leaner fish would turn mushy under the same treatment.

3. 3

   Marinate the fish

   Spread a thin layer of marinade in the bottom of a glass or ceramic baking dish just large enough to hold the fillets in a single layer. Lay the fish skin-side down on the marinade. Now coat the top and sides of each fillet generously, using about half the remaining marinade. The fish should be completely encased, like it's wearing a sweater of sake kasu. Cover tightly with plastic wrap and refrigerate for a minimum of 48 hours, preferably 72. The longer marination allows the enzymes more time to work their magic on the proteins.

   Don't exceed 4 days of marination. Beyond that point, the texture becomes too soft and the flavor grows overly fermented.
4. 4

   Prepare for cooking

   Remove the fish from the refrigerator 30 minutes before cooking. Position an oven rack 6 inches from the broiler element and preheat your broiler on high for at least 10 minutes. A properly heated broiler is essential here. You need intense, direct heat to caramelize the sugars in the marinade before the fish overcooks. Line a sheet pan with aluminum foil and brush lightly with vegetable oil.

5. 5

   Remove excess marinade

   Lift each fillet from the marinade and let the excess drip off for a few seconds. Then, using your fingers or a soft spatula, gently wipe away most of the marinade clinging to the fish. You want a thin coating remaining, not thick globs. Too much marinade will burn before the fish cooks through, leaving bitter black patches instead of that gorgeous mahogany lacquer. The fish should look glazed, not plastered.

   Don't rinse the fish. Wiping is enough. You want the flavor compounds that have penetrated the flesh to remain.
6. 6

   Broil the fish

   Place the fillets skin-side down on the prepared sheet pan, leaving space between each piece. Slide the pan under the broiler and watch carefully. The marinade will begin to bubble and blister within the first minute. By three minutes, you should see golden patches forming. At four to five minutes, the surface should be deeply caramelized, almost burnished, with darker spots at the edges. The fish is done when the flesh flakes easily under gentle pressure and the thickest part registers 125°F on an instant-read thermometer. If your broiler has hot spots, rotate the pan halfway through cooking.

   Every broiler runs differently. The first time you make this, hover near the oven and check every 30 seconds after the 3-minute mark. The sugars can go from perfect to scorched in moments.
7. 7

   Rest and serve

   Transfer the fish to warm plates immediately but let it rest for just one minute before serving. This brief pause allows the internal temperature to equalize without the fish cooling too much. The flesh should appear opaque and creamy white, pulling apart in large, luscious flakes. Scatter the scallions over each fillet and finish with a pinch of toasted sesame seeds. Serve with pickled ginger alongside to cut through the richness.

Chef Tips

• •Source your sablefish from fishmongers who can tell you where and when it was caught. Alaska and British Columbia run sustainable longline fisheries with excellent practices. Avoid trawl-caught fish when possible. The Marine Stewardship Council certifies responsible sablefish operations worth seeking out.
• •Sake kasu varies widely by producer. Some is dry and crumbly, some moist and paste-like. Adjust your mirin and sake quantities to achieve that peanut butter consistency. Start with less liquid for wet kasu, more for dry.
• •White miso (shiro miso) is essential here. Red or mixed miso will overwhelm the delicate fish with too much funk. Look for miso labeled 'sweet' or 'mild' for best results.
• •This dish pairs beautifully with steamed short-grain rice, which provides a neutral backdrop for the intense flavors. A simple cucumber salad dressed with rice vinegar offers cooling contrast.
• •Serve with a sake that echoes the marinade. A junmai style with good acidity complements without competing. If you prefer wine, look to off-dry Riesling or a mineral-driven Grüner Veltliner.
• •Save any leftover marinade. Stored in the refrigerator, it keeps for a month. Use it on salmon, chicken thighs, or pork belly. The flavors develop further with age.

Advance Preparation

• •The marinade can be prepared up to 2 weeks ahead and refrigerated in an airtight container.
• •Fish must marinate for 48-72 hours before cooking. Plan accordingly and mark your calendar.
• •Once marinated, fish can be wiped of excess marinade and held, covered, in the refrigerator for up to 6 hours before broiling.
• •This dish does not reheat well. Cook only what you'll serve immediately. The caramelized surface softens and the fish dries out when reheated.

Frequently Asked Questions

Nutrition Information

1 serving (about 265g)