-
1
Pulse flour, sugar and salt in a food processor until blended. Add butter; pulse until butter is the size of peas. Combine egg yolk and 2 tablespoons ice water; slowly add to processor until dough holds together, adding remaining ice water, if needed, 1 tablespoon at a time. Shape dough into a disk; wrap and refrigerate 1 hour or overnight.
-
2
Preheat oven to 400u00b0. Scrub sweet potatoes; pierce several times with a fork. Bake until tender, 45-50 minutes. Cool slightly; peel and mash to yield about 4 cups. Reduce oven setting to 350u00b0.
-
3
On a lightly floured surface, roll dough to a 1/8-in.-thick circle; transfer to a 9-in. deep-dish pie plate. Trim to 1/2 in. beyond rim of plate; flute edge. Refrigerate 30 minutes.
-
4
For filling, beat sugar, butter, pie spice and salt until blended. Add eggs and vanilla; beat in cooled sweet potatoes until smooth. Add filling to chilled crust. Bake on bottom rack until a knife inserted in center comes out clean, 40-45 minutes. Keep warm.
-
5
Meanwhile, for meringue, combine sugar, water, molasses and salt in a small saucepan over medium-high heat;
-
6
using a pastry brush dipped in water, wash down the sides of the pan to eliminate sugar crystals. When mixture comes to a boil, stop brushing. Cook without stirring until a thermometer reads 240u00b0 (soft-ball stage).
-
7
As molasses mixture cooks, preheat broiler. Beat egg whites, cream of tartar and spices on medium speed until soft peaks form. While beating, gradually drizzle hot molasses mixture over egg whites; continue beating until stiff glossy peaks form. Spread meringue over warm pie; broil 4-6 in. from heat until slightly browned, 1-2 minutes. Cool on a wire rack.
