Claim: The main ingredient of Tteok, a rice cake which comes from Korea is rice however sesame seeds are used in some cases.
Evidence: Tteok (Korean: 떡) 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 (멥쌀, mebssal in Korean) or glutinous rice (찹쌀 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