Cobia sushi and sashimi with mirin-nori rice, crisp daikon, and dashi glaze

Ingredients

• 600 g sashimi-grade cobia fillet, skinless and boneless
• 360 g Japanese short-grain sushi rice
• 70 ml Japanese rice vinegar
• 120 ml Japanese mirin
• 25 g fine cane sugar
• 8 g fine sea salt
• 4 sheets toasted nori seaweed sheets for sushi
• 250 ml ready-to-use Japanese dashi
• 80 ml Japanese light soy sauce (usukuchi)
• 10 g dried Japanese kombu kelp
• 12 g dried bonito flakes (katsuobushi)
• 2 tsp toasted sesame oil
• 250 g fresh daikon radish
• 1 bunch fresh scallions
• 80 g pickled sushi ginger (gari)
• 30 g high-quality prepared wasabi paste
• 12 g toasted white sesame seeds

Method

1. Inspect the fish before slicing: it must smell clean and marine, with firm, glistening flesh held between 32 and 40 °F (0 and 4 °C). For raw preparation at home, use only fish sold as sashimi grade or commercially frozen according to food safety guidelines.
2. Rinse the sushi rice in several changes of cold water, swirling gently, until the water runs completely clear rather than milky. Drain in a colander, then let rest for 30 minutes so the grains absorb surface moisture and cook evenly.
3. Cook the rice covered with its measured cooking water: bring to a boil over high heat, then reduce to very low heat and cook at a gentle simmer for 12 minutes, until all liquid is fully absorbed. Remove from the heat and let rest covered, without lifting the lid, for 10 minutes to allow the steam to finish cooking the core of the grains.
4. Meanwhile, prepare the sushi vinegar seasoning: warm the rice vinegar over low heat (around 140 °F / 60 °C) for 2 to 3 minutes with part of the mirin, the sugar, and the salt, just enough to fully dissolve the crystals without bringing it to a boil. The mixture should remain clear and glossy without a harsh alcohol aroma.
5. Spread the warm rice out into a wide non-metallic bowl or platter. Drizzle over the seasoning, then gently slice through the rice with a flat spatula without crushing the grains. Fan vigorously for 5 minutes until it cools to lukewarm room temperature (around 85 to 95 °F / 30 to 35 °C), turning glossy and slightly sticky while keeping the grains distinct.
6. Prepare the glaze: simmer the dashi with the light soy sauce, the remaining mirin, the kombu, and part of the bonito flakes over medium-low heat (around 195 °F / 90 °C) for 12 to 15 minutes, until reduced by half and lightly coating the back of a spoon. Strain, let cool for 15 minutes at room temperature, then whisk in the toasted sesame oil off the heat.
7. Cut the daikon into a fine 2 mm julienne or paper-thin ribbons. Plunge into a bowl of ice water for 10 minutes, then drain thoroughly: it should turn remarkably crisp, translucent around the edges, and well drained.
8. Thinly slice the scallions. Wave the nori sheets briefly over a low open flame or toast in a dry skillet over low heat for 30 seconds per side until crisp, brittle, and deep toasted green.
9. Trim the cobia fillet with a very sharp knife. Remove any dark bloodline or fibrous tissue, then pat dry with paper towels. The flesh should look satiny with no surface moisture, kept thoroughly chilled.
10. For the sashimi, cut part of the cobia into clean, slightly angled slices about 5 to 6 mm thick, cutting across the grain for supple, uniform pieces. Pull the knife through in a single continuous motion without sawing to maintain a perfectly smooth surface.
11. For the nigiri, lightly moisten your hands, shape warm rice into loose, airy oblong pillows of about 20 g each, and drape a slice of cobia over top. Press gently for 2 seconds to bind the fish and rice: the nigiri should hold its shape firmly yet collapse tenderly in the mouth.
12. For simple maki rolls, place a half-sheet of nori shiny side down, spread a thin 5 mm layer of rice across it, and lay a neat line of cobia strips and sliced scallions along the center. Roll tightly using a bamboo mat, holding firm pressure for 5 seconds. Slice the roll into 6 equal rounds with a moistened blade.
13. Lightly brush a few slices of cobia sashimi and selected nigiri with the cooled glaze. The fish should take on a delicate sheen without pooling liquid, elevating its natural marine umami.
14. Arrange the sashimi in a fan alongside the drained crisp daikon, set the nigiri in the center, and place the maki rolls to the side. Garnish with toasted sesame seeds, scallions, a pinch of crushed bonito flakes, pickled sushi ginger, and a small mound of prepared wasabi on the side.
15. Serve immediately at ideal tasting temperatures (chilled fish at 50-54 °F / 10-12 °C, lukewarm rice at 90 °F / 32 °C) with a small dish of soy sauce. Savor sequentially: unseasoned cobia, glazed cobia, then nigiri and maki to appreciate the full balance of textures and flavors.

Nutrition

Per serving

Energy

531.9 kcal

Protein

16.83 g

Carbohydrate

94.4 g

Fat

6.65 g

Fibre

5.41 g

Calcium

75.89 mg

Iron

1.33 mg

Magnesium

53.43 mg