Grass is made of grass, so it is called grass. It was first discovered by Jiuhuashan people in Miaoli County, Taiwan, China, that Cao Xian would become a jelly-like solid after being directly boiled and cooled. This practice spread to Fujian and Guangdong, and became popular in Japan and Southeast Asia. Fairy grass is said to be famous for its hay in Jiuhua Mountain, Miaoli County, Taiwan. Decades ago, people ate Cao Xian, mainly by cutting it into small cubes, and then simply adding sugar water and crushed ice. Although there are hot drinks, it is better to eat them frozen. Add lentils in sugar water and black pearls with elastic teeth, and the ice is refreshing and calm.

Cao Xian is a millet, which is shaped like mint leaves, small in green, and more common in low-altitude foothills. A long time ago, because of the inconvenient transportation, people went in and out by their legs, and it was easy to get heatstroke on the road in hot weather. A doctor gave a grass plant with special fragrance to passers-by, and people felt refreshed and recovered quickly after eating it. People think that this magical grass was given by the gods, so it was named "Cao Xian". Authentic Taiwan Province Xiancao is made of Xiancao as raw material, boiled with slow fire, and added with special edible starch, without any additives, which is cool and antipyretic and suitable for all ages.