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1
Prepare the kuromitsu first. Combine the kokuto and water in a small saucepan over low heat. Stir until the sugar is fully dissolved, then simmer briefly until the syrup thickens slightly. Remove from heat, cool, and refrigerate. The syrup should be pourable but coat the back of a spoon.
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2
Bring a wide, shallow pot of water to a full boil — sufficient to support flat pans by steam. Lightly oil the interior base of two or three flat metal pans (approximately 20 cm square, or equivalent shallow trays). Prepare a large bowl of ice water and set it beside the stove.
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3
Place the honkuzu in a bowl. Pour the cold water over it and stir until the starch is fully dissolved with no lumps remaining. Do not allow the mixture to warm — cold dissolution is essential. The liquid will appear milky and opaque at this stage.
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4
Pour a thin, even layer of the kuzu mixture into each prepared pan — no more than 3–4 mm deep; the layer must be thin enough that light passes through it once set. Set the pans over the boiling water, cover, and steam for 3–4 minutes. This is where the dish lives or dies: the layer must be thin enough to set translucent under steam, not opaque and dense — a thick pour cannot recover its texture or visual purity.
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5
When the kuzukiri has set — the surface will appear fully translucent, smooth, and no longer milky — immediately slide the pan into the ice bath or submerge its base to halt all residual heat. Failure to cool at once allows continued setting from retained steam heat.
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6
Lift the set kuzukiri sheet from the cold water. Cut into strips 5–6 mm wide while the jelly remains cold. The cut noodles should hold their shape cleanly without tearing or fusing. Return to cold water to hold until service.
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7
Drain the kuzukiri and arrange in chilled bowls. The ideal serving temperature is 8–12 °C — cold, but not frozen. Serve the kuromitsu in a small cup alongside for dipping. Offer kinako separately if using.