In a mixing bowl, combine the chocolate cookie crumbs and melted butter. Press the mixture into the bottom and sides of the pie dish to create the crust. Chill in the refrigerator while you prepare the filling.
In a small bowl, sprinkle the unflavored gelatin over the cold water. Let it sit for a minute to soften.
Pour the boiling water over the softened gelatin and whisk until completely dissolved.
In another bowl, mix the granulated sugar, crème de menthe liqueur, and crème de cacao liqueur until well combined.
Gradually whisk the gelatin mixture into the sugar and liqueur mixture.
If desired, add a few drops of green food coloring to achieve the signature grasshopper hue.
In a separate bowl, whip the heavy whipping cream until stiff peaks form.
Gently fold the whipped cream into the minty mixture until well combined.
Pour the filling into the prepared crust and smooth the top with a spatula.
Refrigerate the pie for at least 3 hours, or until it's set and firm.
Once chilled, garnish the pie with chocolate shavings or curls for an extra touch of decadence.