Quicksand is a famous Cantonese dim sum, which usually consists of quicksand stuffing and bread. Here are some restaurants that may provide quicksand:

1. Guangdong Teahouse: Guangdong Teahouses usually serve traditional Cantonese dim sum, including quicksand buns. These teahouses are usually located in Guangdong, such as Guangzhou, Shenzhen, Zhuhai and other cities.

2. Hong Kong-style restaurants: Hong Kong-style restaurants generally provide Cantonese dim sum such as quicksand bags. These restaurants are usually located in Hong Kong and Guangdong.

3. Chinese restaurants: Some Chinese restaurants will also provide Cantonese dim sum such as quicksand bags. These restaurants may be located in other parts of China, such as Beijing, Shanghai and Sichuan.

To sum up, if you want to taste quicksand bags, you can go to tea houses or Hong Kong-style tea restaurants in Guangdong or Hong Kong, or try Chinese restaurants in other regions. In addition, if you want to make your own quicksand bag, you can also go to the market or supermarket to buy fresh fish and sauerkraut, and then follow the recipe.