1 (14 oz.) can sweetened condensed milk
1 1/2 oz. Triple Sec (3 tbsp.)
1 1/2 oz. tequila (3 tbsp.)
1/4 c. fresh lime juice
2 c. whipping cream, whipped green food coloring; optional
1 (9 inch) graham cracker crust
Whipped cream, lime slices, mint - for garnish

Combine sweetened condensed milk, liqueur, tequila, lime juice, whipped cream, and food coloring. Pour in graham cracker crust. Cover and freeze 4-5 hours or overnight. Let stand a few minutes before cutting. Top pie with whipped cream.