Custard powder is a kind of spice powder, which is suitable for soft, fragrant and smooth hot and cold desserts, such as cakes, egg rolls, fillings, bread, egg tarts and other cakes.

It is characterized by sufficient viscosity, fine texture, white color, better luster than mung bean starch and poor water absorption. Windmill powder refers to corn starch, which is a yellowish white powder. Windmill powder is usually made by soaking corn with 0.3% sulfurous acid, crushing, sieving, precipitating, drying and grinding.