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1
Rinse the short-grain rice in cold water, changing the water repeatedly until it runs clear. Combine with 480 ml cold water in a heavy pot with a tight-fitting lid. Bring to a boil over medium-high heat, then reduce to the lowest possible flame and cook, covered, for 12 minutes. Remove from heat and allow to steam, still covered, for a further 10 minutes. The rice is done when each grain is tender, slightly sticky, and holds its shape — open the lid to a clean, rice-scented steam with no raw or scorched smell.
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2
Prepare the dashi fresh: steep kombu in cold water, bring slowly toward a simmer, remove kombu before boiling, add katsuobushi, steep briefly, and strain. This is the structural base of the miso soup and must be made immediately before the meal — miso soup prepared hours in advance is the most common and consequential error in asa-gohan. The dashi is ready when it is clear, pale gold, and carries a clean ocean-and-smoke aroma with no bitterness.
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3
Salt the fish fillets lightly on both sides with fine sea salt. Grill over bincho-tan charcoal or under a dedicated fish broiler, skin side toward the heat source first. This step is where the dish lives or dies: the salt and char of the yakizakana are the morning's most intense flavour moment, and the fish must arrive at the table hot, with skin crisped and flesh just cooked through — the only protein in the composition capable of fatigue if overcooked or allowed to cool. The fish is ready when the skin blisters and colours to a deep, even gold and the flesh yields cleanly at its thickest point with no translucency.
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4
Dissolve the miso into the hot dashi off direct heat — never boil miso once it has been added, as boiling destroys its fermented character and aroma. Add the reconstituted wakame and the prepared seasonal garnish. Taste: the soup should present a rounded umami depth with no sharp saltiness and no raw fermented edge. Ladle immediately into serving bowls.
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5
Soft-boil the eggs by lowering them into gently simmering water for 6–7 minutes, then transfer immediately to cold water to arrest cooking. Peel and halve before plating, or prepare tamagoyaki in its place according to the entry's instruction. The white should be fully set and the yolk should remain jammy at centre — confirm by gentle pressure through the shell before peeling.
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6
Compose and serve all elements simultaneously: hot rice in its wooden lacquer bowl, miso soup in its covered lacquer bowl, grilled fish, tsukemono, egg, and natto (where included) arranged on the tray in accordance with the ichiju-sansai (one soup, three sides) or ichiju-issai format determined by the formality of the occasion. Ideal timing delivers hot soup, hot rice, and warm fish to the table at the same moment — temperature divergence across the composition signals a failure of coordination, not of individual preparation.