Make the crust: Preheat oven to 350°F. Combine crushed pretzels, sugar, and melted butter. Press firmly into a 9-inch pie dish. Bake for 8-10 minutes. Cool completely.
Mix the filling: In a large bowl, whisk together condensed milk, lime juice, zest, tequila, and orange liqueur.
Whip the cream: In a separate bowl, whip heavy cream until stiff peaks form. Gently fold into the lime mixture until fully combined.
Assemble: Pour filling into cooled crust. Smooth the top.
Freeze: Freeze at least 6 hours or overnight.
Serve: Let sit 10 minutes before slicing. Garnish with lime wedges, zest curls, or a sprinkle of flaky sea salt.
Notes
For a kid-friendly version, skip the alcohol and use 1/4 cup lime juice + 2 tbsp orange juice.
Crust can be made a day ahead and stored at room temp.
Use full-fat sweetened condensed milk for best texture.