It is usually filled or covered with sweet mung bean paste , red bean paste , raisins , or a sweet , creamy filling made with sesame seeds , pumpkin , beans , pine nuts , and honey . It is served either filled or covered with sweetened mung bean paste , red bean paste , mashed red beans , raisins , a sweetened filling made with sesame seeds , sweet pumpkin , beans , jujubes , pine nuts , and\/or honey ) .