You can buy agar agar here. Kuzu Root is derived from the Japanese plant that is also now common in the American South (it’s called Kudzu in the South). Kuzu is a starch that is commonly used as a food ingredient and in Vietnam is dissolved as a beverage, drunk with pomelo oil. Like arrowroot, kuzu adds shine and produces translucent sauces and gravies. Kuzu powder comes in white chunks that you have to crush (or dissolve in cool liquid) before cooking.