Pastéis de Nata

Created before 1834 by monks at the Jerónimos Monastery in Belém, west of Lisbon. Religious orders used egg whites to starch laundry and clarify wine, which left huge volumes of yolks; the monks turned the surplus into custard tarts. After Portugal's 1834 monastic dissolution, the recipe was sold to a nearby sugar refinery, which opened Pastéis de Belém in 1837 — still operating, still using the original (sealed) recipe.

Jerónimos monks in Belém invented them before 1834, using up yolks left over from starching laundry with whites. After the 1834 monastic dissolution the recipe sold to the sugar refinery that opened Pastéis de Belém in 1837. The 280–320 °C oven is what scorches the top black.

A small custard tart, two-bite size, eaten warm with cinnamon and powdered sugar shaken on at the counter. The shell is laminated puff pastry — shatteringly crisp, hundreds of paper layers — and the top of the custard is scorched almost black in spots, the rest deep yellow. Eaten standing, in three bites max, with an espresso (bica). Cold from a fridge case, it's a different food.

Two technical pieces: the puff (laminated with butter or lard, often baked at extreme heat — 280–320 °C — to puff fast before the custard sets) and the custard (a cooked base, not raw — flour-thickened milk, then yolks and sugar tempered in, so it survives the high oven without curdling). The black-spot scorch is from sugar caramelizing on the surface, only achievable with intense top heat.