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1
Hang the whole daikon in a cool, airy place in full sun — suspended by their trimmed tops if possible — for 2 to 3 weeks. The daikon are ready when they have lost approximately 40% of their original weight, the skin is lightly wrinkled, and the flesh bends without snapping rather than cracking cleanly.
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2
Combine the rice bran, salt, and sugar in a large bowl. Add the crushed gardenia pods and the dried persimmon skin if using. Mix thoroughly by hand until the salt and sugar are evenly distributed through the bran. The mixture should feel like damp, coarse sand — neither clumping into wet paste nor dusty and dry.
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3
Spread an even layer of the nuka mixture across the base of a clean wooden barrel or deep ceramic crock. Lay the wilted daikon in a single tight layer on top. Cover completely with the remaining nuka mixture, pressing it firmly into all gaps around and between the daikon so no air pockets remain. The daikon must be fully encased — any exposed surface will not ferment correctly.
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4
Set a wooden drop-lid (otoshibuta) or a plate cut to fit directly on the surface of the packed nuka, then apply a heavy weight — traditional stone weights in a wooden barrel are correct; the total applied weight should be roughly equal to the weight of the daikon. After 24–48 hours, brine drawn from the daikon should rise to just meet the underside of the lid. If no brine has risen after 48 hours, increase the weight.
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5
Ferment at cool room temperature — a cellar or unheated room is ideal. After 2–3 weeks the first lactic fermentation produces a notably pungent, sulphurous smell and the nuka surface begins to show slight activity. This smell is characteristic and correct; a neutral-smelling crock at this stage indicates insufficient fermentation. For a lighter pickle, the daikon may be removed at this point; for full complexity, continue for 1–3 months.
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6
To serve, remove a daikon from the nuka, wipe off the bran, and slice thinly across the radish at 2–3 mm for maximum crunch, or into thicker rounds for a more substantial side. The cut face should be golden-yellow to deep amber and slightly translucent. Bite through a slice: the texture must be firm and audibly crunchy — a soft, yielding slice indicates inadequate pre-drying or under-fermentation.