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1
Brew dashi from kombu and bonito; strain and cool to 50°C.
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2
Whisk eggs gently in a bowl until just combined; avoid incorporating air.
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3
Combine cooled dashi, mirin, usukuchi soy sauce, and salt; fold into eggs.
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4
Strain mixture through fine mesh twice to remove bubbles and achieve silky texture.
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5
Distribute chicken, ginkgo nuts, and shiitake among four chawanmushi cups; pour custard to three-quarters full.
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6
Place cups in steaming basket over 65°C water; steam 12–14 minutes until set but still trembling at center.
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7
Garnish with yuzu zest and mitsuba; serve immediately in original cups.