Simplify the following text for a Grade 10 native English-speaking person.
Original: Tteok refers to all kind of rice cakes made from either pounded rice ( ë '' ë -- , metteok ) , pounded glutinous rice ( ì ë -- , chaltteok ) , or glutinous rice left whole , without pounding .
Simplified: Tteok means all rice cakes made from pounded rice ( ë '' ë -- , metteok ) , pounded glutinous rice ( ì ë -- , chaltteok ) , or glutinous rice that has not been pounded .