Pastel de Belém is a traditional egg custard tart and a predecessor to the famous pastel de nata. The tarts are made with a pastry shell that's filled with a combination of milk, eggs, sugar, lemon, and cinnamon. The first recipe for pastel de Belém dates back to 1837 when it was produced by the monks of the Jerónimos monastery.

Only the custard tarts produced at the Fábrica Pastéis de Belém can be called pastel de Belém, while all the others, produced by other patisseries in Lisbon are called pastel de nata. Regardless of the name, these tarts can be served hot or cold and in 2009, The Guardian listed pastel de Belém as one of the 50 'best things to eat' in the world.