Pastéis de Belém are traditional Portuguese custard tarts, originating from the Belém district of Lisbon. They are made with a flaky pastry shell filled with a creamy custard, often flavored with cinnamon and lemon zest. These tarts are baked at high temperatures, giving them a crispy exterior and a soft, rich filling. The recipe for Pastéis de Belém is a closely guarded secret, known only to a few. They are typically served warm, dusted with powdered sugar and cinnamon. These pastries have become a popular treat, enjoyed by locals and tourists alike, and are a symbol of Portuguese culinary heritage.