Margarita Pie

This is a weight watchers recipe, from mom.

1 & 1/3 oz miniature twist prezels (about 2 c.)
1 T. sugar
2 T. light butter, room temperature
6 oz frozen limeade concentrate, slightly thawed
4 c. light vanilla ice cream
1 & 1/2 oz tequila (about 3 T)
1/2 fl oz orage-flavored liqueur
1 t. lime zest

Blend pretzels until crumbs. add sugar and pulse until combined. add butter and mix well. while machine is running add 2 T. limeade concentrate until well mixed. spoon mixture into ungreased 9 inch pie plate. press firmly into bottom and sides of pie plate. Bake until set (375 for about 5 minutes) freeze for 10 minutes to cool. in a clean mixer, combine ice cream, remaining limeade concentrate, tequila, and liqueur. mix until just blended. spoon into cooled pie crust. sprinkle with lime zest. freeze 2 hours before serving.