Mom's Custard Pie

On a lightly floured surface, roll dough to a 1/8-in.-thick circle; transfer to a 9-in. pie plate. Trim crust to 1/2 in. beyond rim of plate; flute edge. Refrigerate 30 minutes. Preheat oven to 425°. Line unpricked crust with a double thickness of foil. Fill with pie weights, dried beans or uncooked rice. Bake on a lower oven rack until edges are light golden brown, 15-20 minutes. Remove foil and weights; bake until bottom is golden brown, 3-6 minutes longer. Cool on a wire rack. Reduce oven setting to 350°. Separate 1 egg; set the white aside in a large bowl and let stand for 15 minutes. In a small bowl, beat the yolk and remaining eggs just until combined. Blend in the sugar, salt and vanilla. Stir in milk. Beat reserved egg white until stiff peaks form; fold into egg mixture. , Carefully pour into crust. Cover edge of pie with foil. Bake for 25 minutes. Remove foil; bake until a knife inserted in the center comes out clean, 15-20 minutes longer. Cool on a wire rack. Sprinkle with nutmeg. Store in the refrigerator.