Kudzu powder

Kudzu powder, called géfěn (葛粉) in Chinese, kuzuko (葛粉; くずこ) in Japanese, chik-garu (칡가루) or galbun (Korean: 갈분; Hanja: 葛粉) 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.

Examples of dishes that use kuzuko:

Examples of wagashi (Japanese desserts) with kuzuko:

Examples of Tong sui (Chinese desserts usually in soup form)