The main ingredient of Tteok, a rice cake which comes from Korea is rice however sesame seeds are used in some cases.
Tteok (Korean: ) is a class of Korean rice cakes made with steamed flour made of various grains, including glutinous or non-glutinous rice. The main ingredients for steamed tteok or "sirutteok" are rice (, mebssal in Korean) or glutinous rice ( chapssal), and sometimes they are mixed together. In some cases, other grains, beans (azuki beans or mung beans), sesame seeds, wheat flour, or starch are mixed with the rice. Flour made of various grains, including glutinous or non-glutinous rice 
