Japan — kashiwa-mochi is indigenous Kanto development; chimaki derives from Chinese Heian-period court introduction
Kodomo no Hi (Children's Day, May 5), formerly Tango no Sekku (Boys' Day), is observed with two specific wagashi confections whose plant wrappings carry symbolic and antimicrobial functions: kashiwa-mochi and chimaki. Kashiwa-mochi is a round mochi filled with smooth or coarse azuki bean paste (or occasionally miso-bean paste) and wrapped in a kashiwa oak leaf, which is not eaten but whose presence is symbolic — the kashiwa oak retains its dead leaves through winter until new leaves push them off in spring, representing the hope that the family line continues without interruption (kashiwa = oak, no = possessive, ha = leaf, but also 'no interruption'). The leaf also imparts a faint green, grassy fragrance to the mochi surface. Chimaki are cone-shaped glutinous rice preparations (sometimes sweetened, sometimes plain rice cake) wrapped in bamboo or cogon grass leaves and tied with dried rush grass, then steamed. The bamboo or grass imparts a clean herbal fragrance. Chimaki were originally a Chinese ritual food (zongzi) introduced to Japan during the Heian period as Tango offerings, while kashiwa-mochi is a purely Japanese development. Regional variations: in Kansai and westward Japan, chimaki dominates Children's Day over kashiwa-mochi; in Tokyo and Kanto, kashiwa-mochi is the norm — the geographical boundary is sometimes called the 'kashiwa-chimaki line.'
Kashiwa-mochi: soft white mochi, sweet azuki filling, faint oak-leaf grassiness; chimaki: clean bamboo-herbal fragrance infused into sweet or plain glutinous rice
{"Kashiwa leaf should be fresh in spring — dried leaves are used out of season but fresh leaves provide the characteristic grassy fragrance","Kashiwa-mochi mochi should be made with a combination of joshinko (rice flour from non-glutinous rice) and shiratamako (glutinous rice flour) for the correct slightly chewy, not fully stretchy texture","Chimaki outer leaf and inner leaf layer must be secured with a specific knotting technique to prevent unravelling during steaming","Sweet chimaki (wagashi style) uses mochi rice cake or yokan-style bean paste; savoury chimaki (rice-based) uses seasoned glutinous rice with meat or chestnut","Kashiwa leaf wrapping is always removed before eating — it is a ceremonial wrapper, not food"}
{"Kashiwa leaves can be blanched briefly and dried for off-season use — wrap and freeze for up to one year","In high-end wagashi, the kashiwa-mochi filling is sometimes white miso bean paste (shiro-miso an) rather than azuki — the savoury-sweet contrast is more refined","For children's day kashiwa-mochi presentations, the mochi are traditionally displayed as three-piece sets representing father, mother, and child","Fresh chimaki tied with three vertical strips of rush grass (igusa) is the traditional presentation — even numbers of ties are considered inauspicious at celebration festivals"}
{"Using fresh bamboo leaves for chimaki that have not been soaked and blanched — unprocessed bamboo leaves release tannins that colour and bitter the rice","Over-filling kashiwa-mochi — if the filling extends to the edge of the mochi, the leaf cannot be folded tightly and the mochi dries during display"}
Japanese Festival Calendar and Folk Customs; Wagashi traditional confectionery surveys