Pastel de Nata
In 1837 in Belém, now in Lisbon city, in an attempt of subsistence, the clerics of the monastery offered for sale Pastéis de Nata (pastels of cream). At that time, Belém and Lisbon were two distinct localities with access secured by steamboats. The presence of the Jerónimos Monastery and the Torre de Belém attracted countless tourists who contributed to spread the Pastéis de Belém.
The Pastel de Nata is a typical Portuguese sweet dish consists basically in puff pastry, milk, lemon, cinnamon, flour, sugar, water and gems. But I will tell you that is not easy to cook it.
Nowadays, you can buy it everywhere in Portugal, it is possible to buy artisanal or mass-produced pastéis de nata.
There is just one place that you can eat the original one: Belém.
The Pastéis de Belém were mentioned by The Guardian as the 15th most tasty delicacy in the world.
If you got curious and you really want to eat, or you can do it when you visit Portugal, or you can try doing it by yourself (youtube tutorial)