Dessert drink made with water chesnut starch ^^, it´s very simple.
See another recipe Cendol, using combinations of tapioca flour, rice flour and Hunkwee/mung bean flour click HERE or in my Multiply *note: Water chesnut contains carbohydrates, and also a good source of dietary fiber, ribolavin, , vitamin B6, and mineral especially potassium (source: Wikipedia).