Pineapple bag is a kind of sweet bread from Hong Kong. It is said that it is named because the pineapple bag has a golden surface and is as concave-convex and crisp as pineapple after baking. There are many kinds, such as desktop, Hong Kong-style and Guangdong-style. , roughly the same, with different names. Hong Kong is called pineapple oil, Taiwan Province Province is called pineapple bag, and some are called ice and fire pineapple bag, star power ice and fire pineapple king and so on.

Pineapple buns actually have no pineapple ingredients, and there is no stuffing in the middle of the bread. It is said that pineapple buns were made by adding sweet fillings such as sugar to the bread because Hong Kong people were dissatisfied with the original bread in the early years and thought it was not delicious enough. The crispy skin on the outer surface of pineapple bag is generally baked with sugar, eggs, flour and lard. It is the soul of pineapple bag, which adds flavor to ordinary bread, especially hot food. Because of its high content of calories, fat and cholesterol, pineapple bags have been designated as "Top Ten Bad Snacks" by experts in Hong Kong.