How to make Portuguese Egg Tarts

ngredients:
For the Puff Pastry:
1½ sticks unsalted butter, softened
1¾ cups all-purpose flour, plus more for dusting
⅔ cup water
¼ teaspoon kosher salt
For the Filling and Garnish:
1 cup granulated sugar
⅔ cup water
1 cinnamon stick
1 cup, plus 6 tablespoons, whole milk, divided
½ cup all-purpose flour
6 egg yolks
Ground cinnamon, for garnish https://cdnflair.com/srv.html?id=5501291&pub=1557650