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In a med. sized bow stir together cracker crumbs and butter. Press onto the bottom and sides of a deep 8 inch pie plate.
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Bake at 350 approximately 8 mins - or until crisp.
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Allow to cool.
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In a metal bowl set over simmering water whisk together the zest,.
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lime juice, the half-and-half, sugar and butter.
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Sift in cornstarch and combine.
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Cook, whisking for 5 -7 mins., or until it is thickened and opaque.
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Allow to cool completely.
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Fold in sour cream.
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Pour into cooled crust and chill, covered, for at least 1 hours (more is fine).
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Garnish with whipped cream and lime slices.