Kudzu powder

Kudzu powder, called géfěn in Chinese, kuzuko in Japanese, chik-garu or galbun in Korean, and bột sắn dây in Vietnamese 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.

Dishes

Examples of dishes that use kuzuko:

Ankake
Goma-dofu

Examples of wagashi with kuzuko:

Examples of Tong sui

Got [Fan soup]