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["Pie filling.", "Preheat oven to 350F.", "Combine the sugar, flour, salt and water in a heavy saucepan.", "Stir constantly over medium-high heat until mixture boils.", "Boil, stirring constantly and vigorously for 1 minute.", "Remove from heat.", "Slightly beat the egg yolks in a bowl with a fork.", "Mix half of the boiled mixture with the egg yolks.", "Then pour the egg mixture into the pan with the other half of the boiled mixture.", "Cook for 1 more minute, stirring constantly and vigorously.", "Remove from heat, and add the butter.", "Add the lemon zest and lemon juice.", "Stir to mix thoroughly.", "Pour into cooled, baked 9-inch pie crust and top with meringue.", "Meringue.", "Beat the egg whites at high speed with an electric mixer until soft peaks form.", "With mixer running, add the cream of tartar, then gradually add the sugar, 1 tablespoon at a time.", "Beat until stiff peaks form.", "Beat in the vanilla.", "Pile on top of pie.", "Be sure to seal the meringue to the pie crust edge when spreading it onto the pie.", "To minimize""weeping"