Custard tarts are a type of pastry consisting of a flaky crust filled with a creamy custard mixture. The filling is typically made from eggs, milk, sugar, and vanilla, which is baked until set. They are often enjoyed as a dessert or snack and can be served warm or chilled. These tarts are popular in various cuisines around the world, with notable variations like the Portuguese Pastéis de Nata and the British Egg Custard Tart. They can be topped with spices, fruits, or caramel for added flavor, making them a versatile treat enjoyed by many.