Sweet Ricotta Pastries

Name: Sweet Ricotta Pastries
Ingredients: 1/2 cup whole milk; 2 (3-by 1-inch) strips orange zest; 1 large egg yolk; 3 tablespoons sugar; 1 tablespoon cornstarch; 1/2 teaspoon pure vanilla extract; 1/2 pound fresh ricotta; 3/4 teaspoon orange-flower water; 2 tablespoons finely chopped candied citron; 2 1/4 cups all-purpose flour; 6 tablespoons sugar; 1/2 teaspoon salt; 2 sticks cold unsalted butter, cut into pieces; 1/2 teaspoon grated orange zest; 2 large egg yolks; 2 tablespoons cold water; 1 large egg beaten with 1 tablespoon water; Equipment: a nonstick muffin pan with 12 (1/2-cup) cups; Garnish: confectioners sugar for dusting