Authentic Shio Koji-Glazed Black Cod

By , Test Kitchen Director · Reviewed by AislePrompt Editorial · ·

A Japanese-inspired dish where shio koji transforms simple cod into a tender, umami-rich masterpiece with perfect caramelized edges. This Japanese-inspired seafood recipe, ready in about 1455 minutes, pairs black cod, shio koji, mirin for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 320 calories and feeds 4, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 1440 min Cook: 15 min Serves 4 Japanese cuisine 320 cal/serving
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Ingredients

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Instructions

  1. Step 1: Pat 1.5 lbs black cod fillets dry with paper towels. In a shallow dish, combine 1/4 cup shio koji, 2 tbsp mirin, 1 tbsp soy sauce, and 1 tsp sesame oil. Add the fish, turning to coat completely, and marinate for 24 hours in the refrigerator.
  2. Step 2: Preheat oven to 400°F (200°C). Remove cod from marinade, discarding excess liquid, and place on a parchment-lined baking sheet. Brush any remaining marinade over fish.
  3. Step 3: Bake for 12-15 minutes until the fish is opaque at the center and edges are slightly caramelized, checking at 10 minutes.
  4. Step 4: Transfer to a plate, sprinkle with 1 tbsp toasted sesame seeds and 3 thinly sliced green onions. Serve immediately with steamed rice.

Frequently asked questions

How long does Authentic Shio Koji-Glazed Black Cod take to make?

Total time is about 1455 minutes (1440 min prep + 15 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.

How do I store leftover Authentic Shio Koji-Glazed Black Cod?

Refrigerate in a covered airtight container for up to 3–4 days (FDA FoodKeeper guideline for cooked fish). Store any fresh salsa or citrus-based garnish in a separate container — it keeps for up to 2 days. Freeze cooked fish (without fresh garnishes) for up to 3 months; thaw overnight in the fridge and reheat gently at 275°F until just warmed through to preserve texture.

Can I substitute ingredients in Authentic Shio Koji-Glazed Black Cod?

Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.

How do I scale Authentic Shio Koji-Glazed Black Cod for a different number of people?

The recipe is written for 4 servings. Multiply each ingredient by (your serving target / 4). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.

What goes well with Authentic Shio Koji-Glazed Black Cod?

Japanese seafood like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.

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