Cetus is short for French toast in Cantonese. When French toast was introduced into Hong Kong, it was originally called "toast". Cantonese is the common folk language in China Mainland and Hongkong, and the local transliteration of "Toast" is "Toast". In fact, it is a rectangular tin bread with or without a lid made of baked tin. Cut the covered toast into squares and put ham or vegetables in it.

Toast is a kind of western bread, which is common in breakfast in Europe and America, and also in tea restaurants in Hong Kong. The raw material is square bread, which is baked with a toaster (called "toaster" in Hong Kong) until it tastes delicious. Take it out, coat one side of the square bread with ingredients such as cream, butter and jam, and sandwich two square buns. This is hot food. Bread contains protein, fat, carbohydrates, a small amount of vitamins and minerals such as calcium, potassium, magnesium and zinc. It has various tastes, is easy to digest and absorb, is convenient to eat, and is very popular in daily life.