1 9-inchpie shell, graham cracker, or baked and cooled pastry crust
1 14-ouncecan sweetened condensed milk
1/2cupkey lime juice
1 8-ouncetub frozen whipped topping, thawed
2 to 3teaspoonsgrated lime zest, optional
Instructions
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In a mixing bowl with an electric mixer, beat sweetened condensed milk and key lime juice until smooth and thickened. Fold in the whipped topping and grated lime peel.
Spoon the mixture into the baked pie shell; cover and refrigerate for about 2 hours before serving, or until set, or freeze for 2 to 3 hours.