INGREDIENTS
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2 cups graham cracker crumbs
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3 tablespoons sugar
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1/2 cup (1 stick) butter, melted
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2 cups heavy whipping cream
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8 ounces cream cheese, at room temperature
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3/4 cup sugar
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1 teaspoon lemon zest
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1 1/2 cups fresh blackberries, plus extra for topping
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1/2 teaspoon vanilla extract