Mochi is a Japanese rice cake made of rice pounded into paste and molded into shapes.
Mochitsuki is the traditional mochi-pounding ceremony in Japan. First, polished glutinous rice is soaked overnight and cooked. Next, the cooked rice is pounded with wooden mallets (kine) in a traditional mortar (usu). Two people will alternate the work, one pounding and the other turning and wetting the mochi. They must keep a steady rhythm or they may accidentally injure one another with the heavy kine. Finally, the sticky mass is then formed into various shapes (usually a sphere or cube).