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1
Preheat the steamer thoroughly before any preparation enters it. A cold start generates condensation that drips onto the food surface. Wrap the steamer lid in a clean cloth; this absorbs condensation and prevents drips onto the preparations during cooking.
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2
Warm the dobin. Divide the dashi among the four vessels, filling each to leave sufficient head space — an over-filled dobin will overflow as steam pressure causes the liquid to expand. Add the sliced matsutake, shrimp, and ginko nuts to each vessel. Seal the lids.
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3
Place the sealed dobin in the preheated steamer. Maintain consistent, gentle steam pressure throughout: 8 to 15 minutes is the operative window for mushimono preparations. Fluctuating pressure produces uneven cooking. Do not lift the lid of the steamer during this period — aroma compounds escape and cannot be recovered.
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4
In the final 2 minutes of steaming, open the steamer and place the mitsuba leaves into each dobin. Reseal and allow the residual steam to set the herb without cooking it further. The mitsuba should be wilted but retain its fresh, green character — this is the sensory confirmation that timing has been respected.
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5
Remove the dobin from the steamer. Set each on its service tray alongside a halved sudachi. The guest squeezes sudachi into the inverted teapot lid, pours the progressively flavoured broth from the dobin into the lid-cup, and drinks first; the solid ingredients are eaten after. The broth should be clear, fragrant with matsutake, and carrying the clean aromatic of the seasonal mushroom without muddiness.
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6
For sakamushi: arrange the scrubbed shellfish in a steaming vessel and add sake — sufficient to generate aromatic steam but not to submerge the clams. The alcohol flavour dissipates during steaming; what remains is a clean aromatic residue on the opened shells. Steam 8 to 12 minutes. The clams are ready when all shells have opened.