Egg custard tarts, also known as Dan Tat, are a sweet dim sum treat that is loved by many. The tart shell is made from a flaky pastry dough, while the custard filling is a mixture of eggs, sugar, milk, and vanilla extract. The tarts are baked until the custard is set and the pastry is golden brown. The contrast between the creamy custard and the buttery crust makes these tarts irresistible. Enjoy them warm or at room temperature for a delightful dessert.