Pastel de Nata is a traditional Portuguese egg tart pastry that originated in Lisbon. It consists of a crispy, flaky pastry shell filled with a creamy custard-like filling made from eggs, sugar, and cream. The tarts are typically sprinkled with cinnamon or powdered sugar and are best enjoyed warm. Pastel de Nata is a must-try when visiting Lisbon, and you can find them in bakeries and pastry shops throughout the city.