4 large egg yolks
1¼ cup sugar, divided
⅓ cup cornstarch
½ teaspoon fine sea salt
½ cup fresh-squeezed lemon juice
3 tablespoons unsalted butter
Blueberry Meringue:
½ cup freeze-dried blueberries
1¾ cup sugar
6 large egg whites
¼ teaspoon cream of tartar
Make the Lemon Pie: Roll out the pie crust to ¼ inch thick. Roll up the dough onto the rolling pin, then gently transfer it to the pie plate. Chill for 10 minutes. Fold the excess pie dough under itself all around the edge of the pie plate, then crimp as desired. Prick the base all over with a fork, and refrigerate the dough for 20 minutes. Preheat the oven to 425°F. Cut a piece of parchment paper to slightly larger than the base of the pie plate. Place it in the base of the chilled pie crust and fill with dried beans or pie weights. Bake until the crust is beginning to lightly brown at the edges, 15 to 17 minutes. Remove the pie weights and continue to bake for 5 more minutes. Remove the pie from the oven and cool completely. Lower the oven temperature to 375°F. Whisk the egg yolks together in a medium bowl. Whisk in ½ cup of sugar. In a medium pot, whisk together the cornstarch, salt and remaining sugar. Add 1½ cups water and begin to heat the mixture over medium heat, whisking constantly. Bring the mixture to a boil; boil for 1 minute. Gradually pour about ⅓ of the cornstarch mixture in the pot into the egg yolks, whisking constantly to combine. Return the yolk mixture to the pot (pour in a slow, steady stream), whisking constantly. Heat the mixture over medium heat, stirring constantly, until the mixture begins to bubble. Continue to cook once large bubbles appear on the surface for 30 seconds, stirring constantly. Stir in the lemon juice and butter, mixing well to combine. Strain the mixture into the cooled pie crust and smooth into an even layer. Bake until the filling is just barely set (it will still look a bit jiggly), 15 to 17 minutes. Cool to room temperature, then chill until firm, at least 1 hour. Make the Blueberry Meringue: In a blender or food processor, pulse the blueberries until they form a fine powder (you should end up with about 2 tablespoons blueberry “powder”). Transfer to a medium pot and whisk in the sugar. Add ⅔ cup water to the pot and heat over medium heat. Stir the mixture until it comes to a boil; once it boils, stop stirring. If any sugar crystals have washed up on the sides, brush them away using a pastry brush dipped in cool water. Boil the sugar syrup until it reads 230°F on a candy thermometer. Meanwhile, place the egg whites and cream of tartar in the bowl of an electric mixer fitted with the whisk attachment. When the syrup reaches 230°F, begin whipping the egg whites on medium-high speed. The goal is to have the egg whites at soft peaks when the sugar reaches the 240°F. Slowly pour the sugar syrup into the egg whites, then continue to whip until it reaches medium peaks, 4 to 6 more minutes. Spoon the meringue on top of the cooled pie and swoosh with the back of a spoon into an even, centered mound. If desired, you can toast the meringue with a kitchen torch or under the broiler, but it’s safe to eat untoasted and it will keep the meringue a prettier color.