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Mix butter, graham cracker crumbs, and sugar together until well combined. Press crust into a 9" pie dish. Set aside.
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Add 2 1/2 cups strawberries to a medium sized bowl. Sprinkle sugar over the strawberries, and allow the mixture to macerate for 15 minutes.
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While the strawberries are macerating, spread lemon curd in an even layer on the bottom of the crust. Add remaining 2 1/2 cups of strawberries over the lemon curd, spreading them out in an even layer (as much as possible). Set aside.
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With a fork, mash the macerated strawberries until the strawberries are in soft, small chunks.
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Add macerated strawberries (including all liquid) and vanilla extract to a small saucepan and cook over med-low heat for 1-2 minutes, stirring occasionally.
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Whisk cornstarch and water together to make a slurry, and add the mixture to the saucepan.
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Cook the mixture for 4-5 minutes, or until the mixture has thickened.
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Allow the mixture to cool completely (about 20-30 minutes).
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Pour the strawberry mixture on top of the strawberries in the pie, spreading the mixture evenly.
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Allow the pie to chill for at least 3-4 hours, or overnight.
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Once the pie has chilled, whip heavy cream with a standing mixer or hand mixer until soft peaks form. Add in powdered sugar and vanilla extract and whip until combined.
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Spread whipped cream over pie and top with strawberries, if desired.
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Refrigerate leftovers.
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Enjoy!