Castrol powder, also known as custard powder, is a kind of spice powder, which is light yellow or light orange yellow, and has strong milk flavor and fruit flavor. It is composed of loosening agent, stabilizer, edible essence, edible pigment, milk powder, starch and filler. Custard powder was originally used to make cakes and puddings in western food, but it was introduced by Hong Kong chefs before it was used in Chinese cooking. Custard powder is easy to dissolve, and is suitable for soft, fragrant and slippery hot and cold desserts (such as cakes, egg rolls, stuffing, bread, egg tarts and other cakes). It is an ideal food spice powder mainly based on its special aroma and taste.