What Is Custard Filling Made Of?
Custard filling is typically made of milk, sugar, egg yolks, and sometimes cornstarch or flour to thicken the mixture. The ingredients are heated together on a stovetop until the mixture thickens, then allowed to cool before being used as a filling for pastries, pies, or other desserts. Flavorings such as vanilla or citrus zest can also be added to enhance the taste of the custard.