Pastry cream, also known as crème pâtissière, is a rich and creamy custard used in various desserts. It is made by cooking a mixture of milk, sugar, eggs, and cornstarch until thickened. This versatile filling can be flavored with vanilla, chocolate, or fruit, making it suitable for tarts, éclairs, and cakes. Once prepared, pastry cream can be cooled and used as a filling or a base for other desserts. It is often whipped to create a lighter texture or combined with whipped cream to make crème légère. Properly stored, pastry cream can last for several days in the refrigerator.