Gyeongdan (경단) or korean rice ball cake is a type of tteok (rice cake) made of glutinous rice or other glutinous cereal flours. when the cereal other than rice is used, its name is usually specified, making compound nouns such as susugyeongdan (수수경단, "sorghum ball cake"). the name chapssalgyeongdan (찹쌀경단, "glutinous rice ball cake") may also be used, but chapssal can be, and usually is, omitted. gyeongdan can be made by kneading glutinous rice flour into chestnut-sized balls, then boiling them in water, and coating them with honey, mashed red beans or mung beans, or toasted and ground sesame seeds, etc. the gyeongdan have various kinds of gomul (고물; powdered sesame or beans, used for coat...

Source: Wikipedia