Set the oven to 325°F / 163°C and leave it for 15 minutes so the rack is actually hot. Weigh all-purpose flour, unsalted butter, egg, whole milk, granulated sugar, cornstarch, ground cinnamon, lemon zest, kosher salt. Pastel de nata is cooked in Lisbon as its own plate, not as a copy of a restaurant menu. Bake butter-dough cups and fill them with a lemon-scented custard until the tops blister. Puff pastry is the usual cup. A butter dough bakes in its place. Amounts are for 4 from foods this library can count.