Sweet-Potato Meringue Pie

Sweet-Potato Pie: Preheat oven to 425°F. Pierce sweet potatoes in a few places with a fork, and bake until very soft, about 1 hour 15 minutes, depending on size of potatoes.

Meanwhile, roll out dough into a 12-inch round on a lightly floured surface. Fit into a 9-inch pie plate, and trim edge, leaving a 1/2-inch overhang. Refrigerate until firm, about 1 hour.

When sweet potatoes are cool enough to handle, scoop out enough flesh to measure 2 cups (reserve any remaining flesh for another use), and transfer to a food processor. Add eggs, milk, cream, sugars, salt, nutmeg, and vanilla, and process until smooth.

Reduce oven temperature to 375°F. Pour filling into crust. Bake until filling puffs and cracks around edge and pie is just set, 50 to 55 minutes. Let cool completely on a wire rack, about 2 1/2 hours. Pie can be kept at room temperature for 1 day, covered loosely with parchment or foil.

Meringue: Beat egg whites, salt, and cream of tartar in a bowl with a mixer on low speed until foamy. Raise speed to high, and add granulated sugar in a slow, steady stream. Whisk until stiff, glossy peaks form, about 5 minutes. Spoon meringue on top of pie. Lightly brown meringue in places with a small kitchen torch (or broil about 7 inches from heat source about 45 seconds).