Pearl was originally a snack in Taiwan, called powder round, and later was added to the Taiwan-style milk tea, renamed pearl. Now some of Taiwan's snacks night market and powder round ice sales. Authentic pearl is neither corn in the things or lotus root powder, nor is it made of glutinous rice, it should be cassava (and sweet potato almost a kind of potato) made of flour, itself is black. Tapioca cold, body cold people should not eat.