According to www.livestrong.com:
Korean rice cake or Tteok is a desert, considered one of Korea's oldest foods, important enough to have a museum dedicated to it. According to the Official Site of Korean Tourism, Tteok has close to 200 variations of size, shape, and color. Boiling, steaming, frying, or pounding are the most common methods that it is prepared.
The ingredients in rice cake depend on the variation of the recipe used. The rice cake we ate seemed to be from the most basic recipe that I found - rice flour, water, salt, and sugar. It was good but not something I'd eat on a regular basis. The students sure loved it!
"I like rice. Rice is great if you're hungry and want to eat 2,000 of something."