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Concierge.com's insider take:
If you're visiting Belém's Mosteiro dos Jerónimos, it is compulsory to stop at this picturesque café tiled with 17th-century scenes for its pasteis de Belémthe best pastéis de nata (custard tarts) in the city, and probably in the world. The recipe is famously the biggest secret in Europe, guarded closely for two centuries and known only to three bakers at any one time. At less than a dollar apiece, you may wish to stock up with a half dozen packed into the café's specially made paper tube.