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1
Prepare and arrange the garnishes. Trim the wanidane to a single, clean piece per bowl. Prepare the tsuma. Cut the suikuchi — yuzu peel, kinome, or fresh wasabi — at the last possible moment; the volatile oils dissipate rapidly once the surface is broken. The garnishes are ready when each is exact, the protein positioned so it will sit naturally in the broth without sinking.
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2
Heat the ichiban dashi gently until it is fully hot but not boiling. The broth must remain crystal clear; any agitation or prolonged high heat will cloud it. The broth is ready when it steams steadily and shows no turbulence.
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3
Place the garnishes in each lacquer bowl in the prescribed order: wanidane at the centre, tsuma to one side, suikuchi last. The bowl should be no more than two-thirds filled. The garnishes should be visible from above — present but not crowded. The dashi, when poured, should be the dominant visual impression.
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4
Season the dashi at the moment of service — not before. Taste the hot broth. Add the salt first, then a few drops of usukuchi shoyu, then the sake. Taste again. The broth should stand at the threshold of what seems too subtle; it will read more assertively when served enclosed and hot. Under-season if in doubt. This is where the dish lives or dies: soy added early loses its aromatic top notes to oxidation; an assertively seasoned suimono cannot be corrected — it can only be diluted with more dashi. The broth is correctly seasoned when no single flavour dominates and the finish is clean, faintly sweet, and without sharpness.
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5
Ladle the seasoned dashi over the garnishes, cover each bowl immediately with its lacquer lid, and serve at once. The lid is correct when the diner, on lifting it, encounters a visible rise of steam and catches the fragrance of the suikuchi before any broth reaches the palate.