For the crust: In a medium mixing bowl mix crushed pretzels with butter and press into 9-inch pie pan.
For the filling: In a small saucepan combine 1/2 of the limeade and gelatin, heat until dissolved and cool completely. Combine remaining limeade, condensed milk, gelatin mixture and zest in a large bowl. In a separate mixing bowl, whip cream until soft peaks form. Fold whipped cream into milk mixture and mound into crust. Chill 2 hours and garnish with candy lime slices.
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