Known as cellophane noodles, glass noodles and, more poetically, spring rain noodles, Longkow are made from mung bean flour extruded as thin vermicelli. Used in the diverse cuisines of Japan, Thailand, Burma, Vietnam, China, Malaysia, Philippines and Indonesia, they may be soaked before boiling; however, do not soak for deep-frying. Simply drop small amounts into very hot oil, and they will puff instantly and remove with slotted spoon.