Pieces of grass jelly cut into approximately 1cm cubes
||Mesona chinensis stalks and leaves, potassium carbonate, starch
Grass jelly, or leaf jelly, is a jelly-like dessert found in China, Hong Kong, Macau, Southeast Asia and Taiwan . It is sold in cans or packets in Asian supermarkets. It is often used in bubble tea.
Grass jelly is made by boiling the aged and slightly oxidized stalks and leaves of Mesona chinensis (member of the mint family) with potassium carbonate for several hours with a little starch and then cooling the liquid to a jelly-like consistency. This jelly can be cut into cubes or other forms, and then mixed with syrup to produce a drink or dessert thought to have cooling (yin) properties, which makes it typically consumed during hot weather. The jelly itself has a slight bitter taste, a light iodine lavender flavor, and is a translucent black.
China, Taiwan, Hong Kong and Macau 
In China, Taiwan, Hong Kong and Macau, grass jelly was traditionally served with sugar syrup. Now it is often served mixed with other ingredients, such as mango, sago, watermelon, cantaloupe, and other fresh or canned fruit, and evaporated milk.
Although this dish is sometimes called liangfen (leung fan) in Chinese, it should not be confused with the Chinese starch jelly liangfen, which is an entirely different dish.
sold on the Sunday Walking Street market in Chiang Mai
In Indonesia, black jelly (Cincau hitam) is manufactured as an instant powder, like other instant jellies or agar. This form is easier to use. It is made from the leaves of Mesona palustris.
Two other plants used in Indonesia are Melastoma polyanthum, known as Cincau perdu, and Cyclea barbata, known as Cincau Hijau or green grass jelly.
Malaysia, Singapore and Brunei 
Plain grass jelly is mixed in various kinds of desserts, such as ice kacang and cendol. It is also mixed with cold soy milk and served as a refreshing drink/dessert, a drink known as Michael Jackson in South-East Asia (a reference to Michael Jackson's changing skin color and/or the song "Black or White"). Various combinations of grass jelly with milk syrup (bandung) are called "bancau"
In Taiwan, grass jelly is known as 仙草 (xian cao), and is used in various desserts and drinks. It can sometimes be added to boba drinks and shaved ice (雪冰). It is also commonly used in a traditional Taiwanese drink, where the jelly is heated and melted to be consumed as a thick dessert beverage (仙草茶, literally Grass Jelly Tea), with numerous toppings like tangyuan, taro balls, azuki beans, and tapioca.
In Thailand, grass jelly is known as chao kuai (Thai: เฉาก้วย [tɕʰâw kuə́j]), and is commonly served relatively plain together with ice and natural brown sugar. Additionally, it can also be served with fruits such as jackfruit, the fruit of the toddy palm or mixed with other Thai desserts.
In Vietnamese, grass jelly is sương sáo or thạch sương sáo. Grass jelly is chopped in small cubes and served as an additional ingredient in sweet desserts made from various kinds of beans (chè). There are two common kinds of grass jelly in Vietnam which are Mesona chinensis (called sương sáo in Vietnamese) and Tiliacora triandra (called sương sâm; sương sa or rau câu is the name for jelly made from various kinds of algae).
See also 
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