It is a moist cake steamed with fillings such as bean paste wrapped in the dough into which rice powder (grated yam powder or finer rice powder) is kneaded with the help of the stickiness of grated yam.
すりおろしたヤマノイモの粘りを利用して米粉（薯蕷粉、上新粉）を練り上げ、その生地で餡等を包み、しっとりと蒸し上げた饅頭。