Street snacks are part of Hong Kong's food culture. Fish eggs, eggs, rice rolls, bowl wings, almsgiving cakes, plaid cakes, paparazzi powder, bean jelly, pork red, beef offal, Saqima, asparagus, crispy dough twists, egg rolls and fried Sambo are all very popular street snacks. Most street snacks come from Guangdong, but a few come from other provinces. For example, Saqima is a Manchu snack. Other salty and sweet snacks in Hong Kong are also full of traditional flavor, some of which are unique to Hong Kong, such as old lady cakes and husband cakes in Yuen Long. Hakka teacups are more popular in outlying islands.

Chezai noodles appeared in the 1950 s. At that time, refugees from the mainland flooded into Hong Kong, making it difficult to make a living, so mobile vendors appeared. In order to facilitate transportation, mobile vendors put all kitchen utensils and food on small wooden trolleys, hence the name Chezaimian. Because customers can choose noodles, ingredients and soup at will, and the price is affordable, they are welcomed by the public.

It is most common in Yau Tsim Mong.