The primary ingredient in a traditional custard is milk. Custard is a creamy dessert made by thickening milk or cream with egg yolks, sugar, and often flavorings like vanilla. Milk gives custard its rich and smooth texture, making it a versatile base for various desserts. Depending on the recipe, the custard can be prepared as either a baked custard or a stirred custard, which is typically served warm or chilled. Custard can also be used as a filling for pastries, a topping for desserts, or served alongside fruits and cakes.