A custard doughnut is a type of sweet pastry that is typically deep-fried and filled with a creamy custard filling. The doughnut is often coated in powdered sugar or glazed, giving it a delightful sweetness. The custard filling is usually made from milk, sugar, and egg yolks, creating a rich and smooth texture. These doughnuts are popular in many countries and can be found in bakeries and cafes. They are enjoyed as a dessert or a treat with coffee or tea. Variations may include different flavors of custard, such as vanilla or chocolate, to cater to diverse tastes.