Finely crush the pretzels and place them in a medium bowl.

Add sugar and melted butter to the crushed pretzels.

Mix the pretzel mixture well.

Press the mixture into a 9-inch buttered pie pan to form the crust.

Chill the crust in the refrigerator for 1 hour.

In another medium bowl, combine lime zest, lime juice, sweetened condensed milk, tequila, and triple sec.

Mix the lime mixture together thoroughly.

Gently fold in 1 cup of whipped heavy cream and green food coloring (if using).

Pour the lime mixture into the chilled pretzel crust.

Freeze the pie for at least 4 hours.

Before serving, decorate the pie with the remaining 1/2 cup of whipped cream.

Arrange pretzels and mint leaves on top of the whipped cream for garnish.

Serve frozen.