Preheat oven to 250°F (120°C). Line two baking sheets with parchment paper.
In a large bowl, beat the egg whites until soft peaks form. Gradually add the granulated sugar, one tablespoon at a time, while continuing to beat until stiff, glossy peaks form.
Add the vanilla extract, lemon juice, and cornstarch. Gently fold to combine.
Divide the meringue into two equal portions and spread each portion into a circle on the prepared baking sheets. Bake the meringues for 90-120 minutes, or until they are completely dry but not browned. Let them cool completely in the oven with the door ajar.
In a separate bowl, whip the heavy cream with the powdered sugar until stiff peaks form. Gently spread the whipped cream over one of the meringue layers.
Arrange the fresh berries over the whipped cream, then carefully place the other meringue layer on top. You can add more whipped cream and berries to the top if desired.
Refrigerate for at least one hour before serving to allow the flavors to meld.
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