INGREDIENTS
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GRAHAM CRACKER CRUST
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3/4 cup graham-cracker crumbs, about 5 crackers
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3 tablespoons unsalted butter, melted
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1 tablespoon sugar
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FILLING
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1 can (14 ounces) sweetened condensed milk
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4 large egg yolks
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1/2 cup fresh key lime juice*
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1/3 cup sour cream
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2 tablespoons grated key lime zest