Portuguese Egg Tarts (Pasteis de Nata)

Ingredients

• 2 cups all-purpose flour, plus more for dusting
• 1/4 teaspoon salt
• 1/3 cup cold water
• 1/2 cup (1 stick) unsalted butter, at room temperature, but not soft
• 1 1/2 cups whole milk
• 1 cinnamon stick
• 1 strip of lemon peel (about 2 inches long)
• 1 cup granulated sugar
• 1/2 cup water
• 1/4 cup all-purpose flour
• 6 large egg yolks, whisked