Make crust: In a food processor, combine pretzels and graham crackers and pulse to make fine crumbs.
Transfer crumbs to a large bowl then stir in melted butter and sugar. The texture should be similar to wet sand.
Grease a 9" pie plate with cooking spray then press the crust mixture into the dish.
Make filling: In a large bowl, whisk together sweetened condensed milk, tequila, lime juice, triple sec and salt until evenly combined. Fold in the Cool Whip and lime zest until just combined.
Pour filling into the prepared crust. Sprinkle more lime zest on top and garnish with small lime wedges.
Freeze until firm, about 4 hours.
Recipe by 5* trending recipes with videos at https://food.theffeed.com/2019/05/04/margarita-pie/