INGREDIENTS
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1 refrigerated pie crust (from a 15-ounce package)
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1 1/2 cups plus 6 tablespoons sugar, divided
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6 tablespoons cornstarch
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1/4 teaspoon salt
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1/2 cup fresh lemon juice
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1/2 cup water
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4 eggs, separated
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1 1/2 cups boiling water
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2 tablespoons butter
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1 teaspoon lemon zest
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1/4 teaspoon cream of tartar