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Whisk together condensed milk and egg yolks.
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Add lime juice and mix.
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Beat 1 egg white until stiff.
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Fold into milk mixture.
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Pour filling into pie crust.
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Beat remaining 3 egg whites, gradually adding sugar and cream of tartar, until stiff peaks form.
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Spread over top of filling.
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Bake at 350F for 12-15 minutes or until meringue is golden brown.
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Cool pie on a rack until room temperature.
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Serve or cover and refrigerate.