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1
Wash the rice until the water runs clear. Cook with the measured water. While warm, turn the rice into a hangiri wooden tub or wide, shallow non-reactive bowl. Combine the rice vinegar, sugar, and salt; stir until the sugar and salt dissolve. Pour the seasoning evenly over the rice and fold it in with a flat rice paddle using cutting strokes, never stirring. Fan the rice simultaneously to cool it rapidly. The rice is ready when it reaches body temperature, carries a mild, distinct vinegar brightness, and the grains are separate yet cohesive.
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2
This step is where the dish lives or dies. The rice must not be used warm — heat wilts raw fish in Kanto preparations and destroys the textural integrity of the whole dish. Confirm the rice has cooled to body temperature by pressing the back of a clean wrist to the surface: it should feel neither warm nor cold. Under-seasoned rice will make the entire dish taste flat; taste a small amount and adjust vinegar seasoning now if needed. Cover the hangiri with a clean damp cloth and hold at room temperature until assembly.
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3
For Kansai-style: prepare each cooked topping separately to preserve distinct flavour. Simmer rehydrated shiitake, soaked kanpyo, and sliced renkon individually in a sweetened dashi until each is tender and has absorbed the cooking liquid. Cool each completely before assembly. The cooked ingredients are ready when each piece is glossy, yielding to gentle pressure, and carries a sweet-savoury depth distinct from the others.
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4
Prepare kinshi tamago. Beat the eggs with the sugar and salt until fully combined. Cook paper-thin sheets in a lightly oiled pan over low heat, one at a time, until just set with no wet surface remaining — sight confirms the moment. Cool the sheets completely on a board, then stack and julienne finely into threads.
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5
For Kanto-style assembly: divide the sushi rice among four bowls or a lacquer juu-bako box. Arrange the sliced sashimi-grade fish in colour-contrasting groups over the surface — not scattered randomly, but placed with clear visual intention. Lay kinshi tamago threads across the rice, scatter shiso chiffonade, nori strips, and place ikura in small clusters. Add pickled ginger to the side. The finished bowl should present distinct colour groups visible from above.
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6
For Kansai-style assembly: add the cooled cooked toppings to the seasoned rice and fold once, gently, at the last moment — enough to distribute without mashing. Over-mixing creates an undifferentiated mass rather than distinct, identifiable ingredients. Finish the surface with kinshi tamago threads, shiso chiffonade, nori strips, ikura, and pickled ginger. Each topping should remain individually legible to the eye.