Japanese Ginkgo Nut Ginnan Autumn Delicacy and Tea Ceremony Applications

Nationwide autumn seasonal ingredient; temple and shrine ginkgo trees of cultural significance; commercial production in Aichi and Osaka

Ginnan (銀杏, ginkgo nuts) are one of Japan's most distinctive autumn ingredients — the seed kernels of the ancient ginkgo tree, jade-green when fresh and cooked, with a uniquely rich, slightly bitter, resinous flavour that has no equivalent in Western cuisine. They are harvested in October-November when the outer fruit (highly malodorous) falls from female ginkgo trees. Processing requires protective gloves — the outer fruit contains urushiol (same compound as poison ivy) that causes skin reactions. The seeds are then boiled, their shells cracked, and the thin inner skin rubbed off to reveal the translucent green nut. Applications: chawanmushi (the classic placement of two or three ginnan in the steamed custard cup — their richness complements the egg custard); cha-kaiseki (as a tea ceremony seasonal ingredient in autumn); yakitori (skewered with rock salt); grilled in the shell until shells crack open; in dobin-mushi (autumn seafood and vegetable broth served in a small clay pot). Ginnan's distinctive character comes from ginkgolide compounds — consumed in very large quantities these cause reactions, so portions are intentionally small (three to five per serving). Their age as a species (Ginkgo biloba is a living fossil, 200+ million years old) adds cultural resonance — in Japan, ancient ginkgo trees at shrines are considered sacred.

Richly earthy, slightly bitter, resinous; jade-green colour; uniquely dense for a nut; contrasts and complements the custard richness of chawanmushi