01 -
Preheat the oven to 190°C (375°F).
02 -
Combine pretzels and sugar in a bowl. Stir in melted margarine and mix until evenly incorporated and moistened. Press the mixture into the bottom and sides of a 9-inch pie plate.
03 -
Bake the crust in the preheated oven until the edges are lightly browned, about 5 minutes. Remove and cool on a wire rack.
04 -
Combine sweetened condensed milk, limeade concentrate, tequila, orange liqueur, and green food coloring in a large bowl. Mix until well blended.
05 -
In a separate bowl, beat heavy cream with an electric mixer until soft peaks form. Fold the whipped cream into the condensed milk mixture.
06 -
Spoon the filling into the cooled crust. Cover the pie with plastic wrap and freeze until firm, about 4 hours.
07 -
Let the pie stand at room temperature for 10 minutes before serving. Garnish with lime slices, if desired.