In Taiwan, don’t be alarmed if you’re offered a glass of a dark liquid. Gruesome as it may look, this murky drink will not upset your bowels, nor is it meant to test your courage. This is actually grass jelly tea, made from xiancao, a.k.a. Chinese mesona (Platostoma palustre). In summer, you have it cold, with grass jelly—also made from xiancao plants—enjoying the smooth texture of the jelly cubes as they glide down your tongue.