Meaning
胡桃 (くるみ, Kurumi) is Kurumi (walnut), a Japanese food (grains and seeds).
What is Kurumi (walnut)?
Kurumi ( Juglandaceae spp) are walnuts, but the name is also used for the tree. There is a walnut species native to Japan, onigurumi , which produces harder shells and a heart-shaped nut. The "heartnut" is a cultivar of Japanese walnut distinguished by its fruit, which is heart-shaped in cross section, very hard to crack, and able to yield an unbroken nut meat when cracked. It is a sweet nut without a bitter aftertaste often intrinsic with black and Persian walnuts.