3 tablespoons butter, melted ½ teaspoon vanilla extract 6 egg whites ¼ teaspoon cream of tartar 2 tablespoons confectioners' sugar 1 (9 inch) unbaked pie crust
Directions Heat oven to 375°F (190°C). To seal pie crust, lightly brush egg white. Bake 10 minutes in preheated oven until light golden and crunchy. Remove from oven and lower temperature to 350°F.
Mix flour, brown sugar, and salt in a small bowl; set aside. Scald milk in a double boiler over medium heat while whisking. Whisk in flour slowly. Cook until thickened, stirring regularly; remove from heat.
Set egg yolks in a medium basin. Whisking continually, add 1/3 of the milk mixture to temper the yolks. Return the yolk mixture to the pan. Return to stove and stir regularly until thick. Remove from heat and add butter and vanilla.