Kudzu powder
Kudzu powder, called géfěn in Chinese, kuzuko in Japanese, and chik-garu or galbun in Korean, is a starch powder made from the root of the kudzu plant. It is used in traditional East Asian cuisine mainly for thickening sauces and making various types of desserts.
Examples of dishes that use kuzuko:
Examples of wagashi with kuzuko:
Examples of Tong sui