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1
Tie whole daikon in pairs by their leaves and hang them in a cold, dry outdoor location — an unheated eave or shed — for 2 to 4 weeks. Weigh each radish before hanging and record the figure. The radish is ready when it has shed 30–40% of its starting weight and the skin wrinkles dramatically across the entire surface, yielding slightly when pressed along the body.
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2
Combine the nuka and coarse salt thoroughly in a large crock or wooden tub, working the salt evenly through the bran so that no unmixed pockets remain. The mixture should smell clean and faintly nutty.
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3
Lay a base layer of the nuka mixture across the bottom of the crock. Nestle the dried daikon on top in a single close-packed layer, then bury them completely under the remaining nuka, pressing firmly so no air gaps remain around any surface of the radish. The daikon must be fully enclosed.
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4
Set a drop-lid or plate directly on the surface of the nuka bed and load it with stones or weights totalling 2–3 times the weight of the vegetable. Within the first day or two, pooling liquid should appear at the surface — this confirms adequate pressure and the onset of anaerobic fermentation.
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5
Leave the crock in a cool location undisturbed for a minimum of one month; three months yields characteristic sweetness and full fermented depth; six months or more produces the most prized deep-yellow, intensely pungent result. Do not open before one month has elapsed. At full fermentation the nuka surface will carry a faint, clean sour-sulphurous smell and the radish, when lifted and pressed, will feel firm and dense rather than soft.
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6
Remove a radish, rinse lightly, and slice 3–4 mm thick. The finished takuwan is ready when the flesh is uniformly yellow, dense, and crunchy throughout with no soft or wet zones; the flavour should carry pronounced pungency with a background sweetness from the daikon's natural sugars.
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7
Once the crock is opened, transfer any remaining takuwan to its own brine. Without brine cover the cut surface hardens and loses quality rapidly.