How To Cook Grass Jelly powder

Today is my first time I make Grass Jelly or in my country we call it Cincau.. My husband bought the packet of 100 grams of Grass Jelly powder in Asian shop. I dont know how to cook it because it very easy to get a ready one in my country.. I just love to have it with the Soy milk or Vanilla soy milk and add ice cube, really refreshing.