Egg tarts are a popular pastry that originated in China and are enjoyed in many parts of the world. They consist of a flaky or crispy crust filled with a smooth, creamy custard made primarily from eggs, milk, and sugar. The filling is typically baked until it is set and slightly caramelized on top, giving it a rich flavor. These treats can be found in various styles, with the most famous being the Hong Kong version, which has a golden-brown crust and a silky filling. Portuguese egg tarts, known as Pastéis de Nata, are another well-known variation, featuring a more caramelized top and a slightly different flavor profile.