Hong Kong has a midnight snack culture, and people often eat "sugar water" when they eat midnight snacks. Sugar water in Guangdong is a sweet soup cooked like soup, which is also called "sweet soup". There are many kinds of sugar water, one of which is traditional but ever-changing sugar water, which is "Zhazha".

Zhazha was first introduced into Hong Kong from Macao. It is said that the name Zaza comes from Portuguese. It was invented in the armory of the Macao Garrison by boiling all kinds of beans into a pot of sugar water for lunch. At first, the dregs were mainly beans, and then taro and sago were added and cooked with various materials.

Many people confuse Momoza with Zaza. The former is ice syrup made of oranges, sago, coconut milk, ice cubes and various fruits, while the latter is made of various beans. Probably because of this, the slag gradually has the taste of Nanyang, and coconut milk and flower milk are added to make the slag have a strong coconut fragrance.

Now black glutinous rice will be added to the dregs. There are so many ingredients in a bowl of slag, just like eight-treasure porridge. It is sweet and delicious, but it makes people feel full, which is much healthier than eating other desserts.