Portuguese
Heat the oven to 250C, or its highest setting, and set out 8 cups of a muffin tin.
Roll the pastry into a tight log, cut it into 8 slices, and press each slice into a cup with wet thumbs, pushing the pastry thinly up the sides.
Whisk the flour with 50 ml of the milk until smooth; heat the rest of the milk with the lemon peel and cinnamon stick until steaming, then whisk in the flour mixture and cook for 2 minutes until slightly thickened.
Boil the sugar and water for 3 minutes to make a light syrup, whisk it into the hot milk mixture in a thin stream, and remove the lemon peel and cinnamon stick.
Let the mixture cool for 10 minutes, then whisk in the egg yolks and strain it into a jug.
Fill the pastry cases three-quarters full and bake for 12-15 minutes until the pastry is crisp and the tops are blistered with dark spots.
Let the tarts cool for 10 minutes and dust them with ground cinnamon before serving.