Pastéis de Nata refer to Portugal's small cream tarts with cinnamon and powdered sugar. The custard is made from egg yolks and heavy cream, among other ingredients. According to the popular belief, Pastéis de Nata which is considered as Portugal's confectionary treat were first prepared by the nuns inhabiting the Monastery of Jeronimos of Belem in Lisbon sometime in the 18th Century. The sisters' culinary innovation which is now called Pastéis de Nata became an immediate hit with the local population and was soon included in the menus of bakeries and cafes.