PAVLOVA WITH LEMON CURD AND BERRIES

Steps:

• Make meringue:
• Preheat oven to 300°F with rack in middle. Trace an approximately 7-inch circle on a sheet of parchment paper. Turn parchment over and put on a baking sheet.
• Whisk together superfine sugar and cornstarch in a small bowl.
• Beat whites with a pinch of salt using an electric mixer at medium speed until they hold soft peaks. Add water (whites will loosen) and beat until whites again hold soft peaks.
• Increase speed to medium-high and beat in sugar mixture 1 tablespoon at a time. After all sugar has been added, beat 1 minute more.
• Add vinegar and beat at high speed until meringue is glossy and holds stiff peaks, about 5 minutes (longer if using hand-held mixer).
• Gently spread meringue inside circle on parchment, making edge of meringue slightly higher than center (the "crater" is for curd and fruit). Bake until meringue is pale golden and has a crust, about 45 minutes (inside will still be marshmallow-like).
• Turn oven off and prop door open slightly with a wooden spoon. Cool meringue in oven 1 hour.
• Make Lemon curd while meringue bakes:
• Stir together sugar, cornstarch, and salt in a 2-quart heavy saucepan, then add lemon juice and butter. Bring to a simmer over medium-high heat, whisking, then continue to simmer, whisking constantly, 1 minute. Lightly beat yolks in a small bowl and whisk in 1/4 cup lemon mixture, then whisk into remaining lemon mixture in saucepan. Reduce heat to low and cook, whisking constantly, until curd is thickened, about 2 minutes (do not let boil). Transfer to a bowl and stir in zest. Chill, surface covered with parchment, until cool, about 1 1/2 hours.
• Assemble Pavlova:
• Beat heavy cream until it just holds stiff peaks, then fold 1/4 cup beaten cream into curd to lighten. Spoon lemon curd into meringue and mound berries on top. Serve remaining whipped cream on the side.