A mochi ( MOH-chee; Japanese もち, 餅 [motɕi] ) is a Japanese rice cake made of mochigome (もち米), a short-grain japonica glutinous rice, and sometimes other ingredients such as water, sugar, and cornstarch. The steamed rice is pounded into paste and molded into the desired shape. In Japan, it is traditionally made in a ceremony called mochitsuki (餅搗き). While eaten year-round, mochi is a traditional food for the Japanese New Year, and is commonly sold and eaten during that time. Mochi is made up of polysaccharides, lipids, protein, and water.
https://en.wikipedia.org/wiki/Mochi