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.