Pastéis de Nata (Portuguese Custard Tarts)

Mix the flour with a pinch of salt and enough cold water (roughly 50 parts) to form a shaggy dough. Knead for 5 minutes until smooth. Rest 10 minutes, then roll into a large rectangle on a floured surface. Spread two-thirds of the softened butter in an even, thin layer across the surface. Fold into thirds (letter fold), rotate 90 degrees, roll out again, and repeat with remaining butter. Fold into thirds one final time. Chill for 20 minutes before shaping.

Roll the chilled dough into a tight cylinder about 4cm in diameter. Slice the cylinder into rounds 2cm thick. Press each round into a lightly greased tart tin, working from the center outward with your thumbs to line the sides, creating a thin, even shell that extends just above the tin rim. The walls should be thinner than you think — the butter layers will puff in the oven. Refrigerate the lined tins for 15 minutes before filling.

Warm the milk in a saucepan with the lemon zest and cinnamon stick until steaming but not boiling. In a separate bowl, whisk together the sugar, flour, and egg yolks until pale and smooth. Remove aromatics from the milk. Stream the hot milk gradually into the egg mixture, whisking constantly — never add hot milk to cold eggs all at once. Return the mixture to the saucepan and cook over medium heat, stirring constantly, until it just begins to thicken and the first bubbles appear. Remove from heat immediately. The custard will look too loose — this is correct; it will set in the oven.

Preheat your oven to its maximum temperature — at minimum 240°C (465°F), ideally 260°C or higher. The high heat is non-negotiable: it is what creates the characteristic leopard-spot caramelization on the custard surface. Fill the chilled pastry shells three-quarters full with warm custard. Bake on the top shelf for 12–15 minutes until the pastry is golden-brown and the custard surface is blistered with dark caramelized spots. Allow to cool for 5 minutes before eating.