Salmon With Karashi-su Miso Recipe

Make the marinade

In a small bowl, combine the white miso, rice vinegar, karashi (Japanese mustard), mirin, soy sauce, and sugar. Whisk until smooth and the sugar dissolves. If the paste is very thick, whisk in up to 1 teaspoon neutral oil or a few drops of warm water until it reaches a spreadable, brushable consistency.

Taste and adjust

Taste the marinade and adjust: add a little more rice vinegar for brightness, another 1/4–1/2 teaspoon karashi for heat, or 1/2 teaspoon sugar if you want it sweeter. Keep in mind flavors will concentrate during cooking.

Prepare salmon

Pat salmon fillets dry with paper towels. Sprinkle both sides lightly with salt (about 3/4 teaspoon total divided) and a scant pinch of black pepper. Let rest 10 minutes at room temperature to allow the salt to penetrate and to take the chill off.

Apply marinade

Using a spoon or small offset spatula, spread a thin, even layer (about 1 tablespoon per fillet) of the miso-karashi-su mixture over the flesh side of each fillet. Reserve any extra marinade for serving if desired (keep refrigerated). Do not put a thick layer on the skin side; leave skin bare or lightly oiled so it crisps.

Cooking options overview

You can broil, grill, or pan-sear the salmon. All methods aim to cook the salmon through while allowing the miso glaze to caramelize without burning. Choose one of the following methods.

Broiler method (recommended for even glaze)

Preheat the broiler and position an oven rack 6–8 inches from the element. Line a rimmed baking sheet with foil and oil lightly. Place the salmon skin-side down on the sheet. Broil for 6–10 minutes depending on thickness: start checking at 6 minutes. The glaze should bubble and brown slightly but not burn; salmon should flake easily at the thickest part and reach an internal temperature of 125–130°F (52–54°C) for medium-rare to medium. If glaze is browning too fast, move rack down one level or reduce broil intensity.

Pan-sear method (crisp skin)

Heat a large nonstick or stainless-steel skillet over medium-high heat and add 1 teaspoon neutral oil. When shimmering, place fillets skin-side down and press gently to ensure contact. Cook skin-side down 3–5 minutes until skin is crisp and the salmon is cooked about two-thirds of the way up the sides. Reduce heat to medium, turn fillets skin-side up, spoon the miso glaze onto the flesh, cover loosely with a lid or foil for 1–2 minutes to warm through and set the glaze, then finish uncovered until glaze bubbles and salmon reaches 125–130°F. Total time will be 6–9 minutes depending on thickness.

Grill method (for smoky flavor)

Preheat grill to medium-high and oil grates. Place salmon skin-side down over direct heat and grill 3–5 minutes to get char and crisp skin. Move to indirect heat or lower flame, brush glaze onto flesh side, close lid and cook another 3–5 minutes until glaze is set and salmon reaches desired doneness. Watch glaze to prevent flare-ups; move fish away from direct flame if it begins to burn.

Rest

Remove salmon from heat and let rest 2–3 minutes. Carryover cooking will raise the internal temperature slightly and let juices redistribute.

Finish and plate

Transfer fillets to plates. Sprinkle thinly sliced scallions and toasted sesame seeds over the top. Add a small mound of pickled ginger or grated daikon if using, and serve lemon or lime wedges on the side for a bright squeeze before eating.

Serving suggestions

Serve with steamed rice, sautéed greens (bok choy, spinach), or a simple cucumber salad. Leftover extra marinade can be thinned with a teaspoon of rice vinegar and used as a dipping sauce (keep refrigerated and use within 2 days).