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1
Par-cook the daikon rounds in togi-jiru (rice-washing water) over medium heat until just yielding to a skewer; discard the water. Transfer daikon to a separate pot with lightly seasoned kombu-katsuobushi dashi. Simmer gently, partially covered, until a skewer meets no resistance at the thickest point and the interior tastes as seasoned as the surface — fukumi is achieved.
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2
Simmer the burdock batons in the assertively seasoned soy-mirin dashi (kombu-katsuobushi base) over medium-low heat until fully tender at the thickest point. Add the duck to the same broth; simmer gently until the meat is cooked through and yields to light pressure. Taste a cross-section at the thickest point of the duck: if the interior carries the same depth of seasoning as the surface, fukumi is achieved. This is where the taki-awase lives or dies — each of the dense components must reach full seasoning penetration independently; combined or abbreviated simmering produces surface coating only.
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3
Gently simmer the rehydrated fu in white dashi over the lowest heat; the broth must remain pale throughout. The fu is done when it is plump, heated to the center, and the flesh yields without resistance under a light squeeze — it must not stain or collapse.
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4
Allow the duck, burdock, daikon, and fu each to cool in their respective cooking broths (oki-dashi). This cooling period draws seasoning further into the interior; do not rush it.
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5
Blanch the spinach in rapidly boiling unsalted water until the leaves are vivid and the stems just tender; refresh immediately in cold water, squeeze dry, and dress lightly with usukuchi soy sauce. The colour must remain a saturated green — any yellowing signals over-blanching.
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6
Prepare the nibiru separately: bring fresh kombu-katsuobushi dashi to a gentle simmer and season with usukuchi and mirin to a level distinctly lighter than any of the cooking broths. The broth must be clear and visually clean — cloudiness or excess colour disqualifies it.
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7
Reheat each component separately in its own broth until warmed through. Arrange in a lacquerware bowl following compositional principles — color contrast, height variation, and texture contrast — placing duck and burdock together, daikon adjacent, fu upright, and spinach as the leafy counterpoint. Pour the hot nibiru gently around the base of the components so it pools without covering them. The broth line should sit below the upper face of each element.