If you go to Campo de Ourique you have to stop at Café da Gema
Monsieur Gabriel will welcome you with a great smile and a « Tudo Bom » like only the Brasilians do it
Food is great Pao de Queijo from another dimension , Cozinhas, and last but not least : probably the best caipirinha in whole Lisbon (for a lovely price)
If so many people come here every day there must be a reason :-)
Go There and let Monsieur Gabriel take care of you