For crusts, combine pretzel crumbs and butter in a small bowl.

Press crumb mixture into bottom and up sides of two 8 inch pie pans.

Place in refrigerator to chill.

In a microwave safe measuring cup, sprinkle unflavored gelatin over 1/4 cup margarita mix.

Let mixture stand 2 minutes.

Microwave on high power (100%) 40 seconds; stir thoroughly.

Allow to stand 2 minutes or until gelatin is completely dissolved.

In a large bowl, combine gelatin mixture, remaining 3/4 cup margarita mix, condensed milk, tequila, orange liqueur, and food coloring until well blended and smooth.

Divide filling equally between crusts; chill until firm.

Garnish with lime slices.

Cover and refrigerate.