Many of Portugal’s pastries can be traced back to the country’s once-vast network of convents and monasteries. The religious centres used egg whites to starch their laundry, and had to come up with a use for the excess yolks, legend says. Different regions came up with variations of pasteis de nata (egg custard pastries). To this day, the Lisbon area is known for its version of the tarts and one place to savour them in the city is Pasteis de Belem.