6 oz. can sweetened condensed milk
8 oz. frozen limeade
8 oz. whipped topping
3 to 4 drops green food coloring, or more if desired
1 prepared graham cracker crust or baked pie shell
Lime slices for optional garnish

Thoroughly blend together the condensed milk and the limeade frozen concentrate. Fold in the whipped topping, adding green food coloring a few drops at a time until desired hue is attained. Pour the filling into the prepared graham cracker pie shell. Garnish pie with dollops of whipped topping and lime slices too, if desired.

Refrigerate for about 2 hours prior to serving.