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1
Wash the rice under cold running water until the water runs clear. Cook by the absorption method. While the rice is still hot, dissolve the sugar and salt into the rice vinegar over gentle heat — do not boil. Season the mixture slightly less acidic than standard nigiri shari. Turn the hot rice into a wide, non-metallic vessel (hangiri or large tray). Pour the seasoned vinegar over the rice and fold it in with a slicing motion, fanning the rice simultaneously to cool it. The rice is ready when it reaches 20–22°C: it carries a faint gloss, grains remain discrete, and the surface does not steam.
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2
Peel and slice the renkon into thin rounds. Simmer briefly in sweetened vinegar until just tender. The renkon is done when it is crisp to the bite but translucent at the edges, and the cut faces retain their white colour.
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3
If the ikura is frozen, thaw it submerged in a solution of sake and soy sauce until the roe is plump and yielding. The roe is ready when each sphere is taut and glossy, with no collapsed or shrivelled pearls.
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4
Beat the eggs with a pinch of sugar. Cook in a lightly oiled pan over low heat into a thin, sweet omelette (tamagoyaki sheet). Allow to cool, then cut into fine strips to produce kinshi tamago. The strips are done when they hold their shape without tearing and carry a pale gold colour throughout.
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5
Remove the sashimi-quality fish from refrigeration. Allow it to rest at room temperature until it reaches 12–15°C. The fish is ready when it yields slightly to light finger pressure and has lost its refrigerator chill without any surface moisture developing.
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6
Divide the shari between four lacquered bowls or deep serving dishes, pressing it gently to fill the base without compacting. Arrange the raw fish toppings in distinct, separated sections over the rice — salmon, tuna, hamachi, hirame each in its own zone. Place the uni, ikura, renkon, ebi, and kinshi tamago to create height variation and colour contrast across the bowl. Lay the pickled ginger at the edge. Add all toppings immediately before service; the bowl is complete when no single colour dominates, the rice beneath remains visible at the margins, and no layer is flattened into uniformity.