Another staple of Sintra is its pastries, particularly those known as queijadas, which are small cakes made with fresh cheese, eggs and flour, resting in a crunchy crust. Sintra's queijadas date back to 1227, when they are mentioned not just as a local delicacy, but as a currency! For example, in 1377, the Villa of Mastronas in Sintra was rented to the Monastery of São Vicente de Fora. The congregation was asked to contribute, among other things, six dozens of queijadas. The popularity of queijadas grew mostly around São Pedro de Penaferrim, an area known for its market, where the pastry was sold in bulk. In 1756, the production of queijadas was industrialised by the Factory of Maria Sapa, in the affluent neighbourhood of Ranholas. In the nineteenth century, competition rose from other factories, bringing the popularity of the pastry to its peak.