A sweet Chinese soup typically served at the end of a meal. It can be served hot, room temperature, or chilled.
Soak the rice in water overnight, or at least 4 hours.
Heat the sesame seeds in a large skillet over medium heat. Shake the pan, cooking just until they become fragrant.
Drain the rice and transfer to a blender along with the sesame seeds and 2 cups of the water. Blend to form a smooth mixture.
Transfer mixture to a saucepan with remaining 3 cups water. Bring to a boil over medium heat, stirring constantly. Reduce heat to medium-low and add sugar, stirring to melt. Simmer until soup is the desired consistency.
Adjust sugar and serve.