Glycine max ‘Tsurunoko’ is a traditional cultivar of soybean in the family Fabaceae, valued in Japanese agriculture and cuisine for its large, high-quality seeds. The cultivar name ‘Tsurunoko’ (鶴の子) translates from Japanese as “crane’s child” or “crane’s egg,” a poetic reference to the smooth, rounded, pale seeds resembling eggs, and reflects traditional naming conventions for heirloom crop varieties in Japan.

This cultivar is particularly associated with Hokkaido, where climatic conditions favor the development of large, uniform soybeans with desirable texture and flavor. Like other soybeans, Glycine max ‘Tsurunoko’ is an annual legume that forms symbiotic relationships with nitrogen-fixing bacteria in the soil, allowing it to enrich soil fertility while producing protein-rich seeds. The plant bears pods containing typically two to three seeds, which are harvested when mature and dried.

‘Tsurunoko’ soybeans are highly prized for traditional Japanese preparations that emphasize whole-bean quality. They are commonly used in dishes such as nimame (sweet simmered soybeans), kuromame-style preparations (when darker cultivars are used), and in the production of tofu, miso, and soy milk where a clean flavor and smooth texture are desired. Compared to more industrial soybean varieties, ‘Tsurunoko’ is often noted for its larger size, thinner seed coat, and balanced composition, making it particularly suitable for artisanal food processing.