We wanted our Mile-High Lemon Meringue Pie recipe to produce a tall and fluffy topping, so we made the meringue with a hot sugar syrup, and added a bit of cream of tartar to the egg whites before we beat them. This ensured that the meringue was cooked through and stable enough to be piled high on top of the filling. For our Mile-High Lemon Meringue Pie’s bright citrus flavor, we flavored the filling with lemon zest and lemon juice, then strained the filling to remove the zest. If left in the filling, the zest would mar the texture of our recipe’s silky smooth filling. If using a hand-held mixer, you will need a very large, deep bowl and should move the beaters vigorously in step 3 to avoid underbeating the egg whites. This pie is best on the day it’s made.
1. For the filling: Whisk sugar, lemon juice, water, cornstarch, and salt together in large nonreactive saucepan until cornstarch is dissolved. Bring to simmer over medium heat, whisking occasionally, until mixture becomes translucent and begins to thicken, about 5 minutes. Whisk in yolks until combined. Stir in zest and butter. Bring to simmer and stir constantly until mixture is thick enough to coat back of spoon, about 2 minutes. Strain through fine-mesh strainer into pie shell and scrape filling off underside of strainer. Place plastic wrap directly on surface of filling and refrigerate until set and well chilled, at least 2 hours and up to 1 day.
2. For the meringue: Adjust oven rack to middle position and heat oven to 400 degrees. Combine water and sugar in small saucepan. Bring to vigorous boil over medium-high heat. Once syrup comes to rolling boil, cook 4 minutes (mixture will become slightly thickened and syrupy). Remove from heat and set aside while beating whites.
3. With electric mixer, beat whites in large bowl at medium-low speed until frothy, about 1 minute. Add salt and cream of tartar and beat, gradually increasing speed to medium-high, until whites hold soft peaks, about 2 minutes. With mixer running, slowly pour hot syrup into whites (avoid pouring syrup onto whisk or it will splash). Add vanilla and beat until meringue has cooled and becomes very thick and shiny, 5 to 9 minutes.
4. Using rubber spatula, mound meringue over filling, making sure meringue touches edges of crust. Use spatula to create peaks all over meringue. Bake until peaks turn golden brown, about 6 minutes. Transfer to wire rack and cool to room temperature. Serve.
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