uguisu mochi; mochi with red bean paste and green soy flour
A traditional Japanese sweet: a mochi rice cake filled with sweet red bean paste (anko) and dusted with green kinako (soybean flour), resembling the color of the Japanese bush warbler.
See also: 餅
In spring, you often see uguisu mochi at Japanese confectionery shops.
The green color of uguisu mochi comes from kinako made from green soybeans.