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1
Toast the kinako in a dry pan over low heat for approximately 5 minutes, stirring constantly, until the flour deepens in colour and releases a pronounced roasted-nut fragrance. Tip immediately onto a cold plate to arrest cooking. Set aside. The flour is ready when the aroma is full and dry, without any raw bean note.
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2
Make the kuromitsu: combine the kokuto, water, and salt in a small saucepan. Simmer over low heat, stirring, until the sugar dissolves completely and the syrup thickens slightly — it should coat a spoon in a thin, dark film with a mineral-bitter edge on the nose. Remove from the heat and cool to room temperature, then refrigerate.
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3
Prepare the kuzu-mochi base: whisk the hon-kuzu into the cold water in a medium saucepan until fully dissolved and no lumps remain. The liquid will be white and opaque. Do not add heat until the starch is completely in suspension.
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4
Cook the kuzu mixture over medium heat, stirring constantly with a wooden spoon or heatproof spatula, for 8–12 minutes. This is where the dish lives or dies: the mixture must be stirred without pause and cooked until it transforms entirely from white and opaque to translucent and clear, with a silky, gel-like body. Any remaining opacity indicates undercooking; an undercooked gel will carry raw starch flavour and a grainy texture once chilled.
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5
Pour the translucent kuzu gel into a lightly wetted flat tray or shallow mould. Smooth the surface. Allow to cool briefly at room temperature, then refrigerate at 2–4°C until fully set and cold throughout — the surface should feel firm and cool to the touch, the body yielding a clean, elastic give when pressed.
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6
Prepare the warabi-mochi by the same method as the kuzu: dissolve the warabi-ko in cold water, cook over medium heat with constant stirring until the mixture turns from opaque white to a translucent amber-tinged gel. The warabi gel will be slightly stickier and more elastic than the kuzu gel — the aroma carries a faint earthy note native to the bracken starch. Pour into a separate wetted mould and chill at 2–4°C until set.
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7
To serve: turn the set gels onto a cold surface and cut into neat cubes or rectangles using a wetted knife. Arrange on chilled plates or, optionally, on a bed of crushed ice. Dust generously with the toasted kinako immediately before bringing to the table. Pour the cold kuromitsu alongside or pool it in the cavity beside the mochi. Apply kinako and kuromitsu only at the moment of service — the contrast between dry, powdery kinako and the cool, wet gel must be experienced fresh and must not be allowed to soak.