Combine the first 9 ingredient into a cocktail shaker. Shake well for about 25 seconds. Strain the cocktail into a high-ball glass. The piece of melted Green Creme de Menthe is for garnish purposes. — How to use the melted Green Creme de Menthe: First spread the melted Green Creme de Menthe evenly over a plastic board and leave it to cool and harden.Using a sharp knife, draw the blade across the Green Creme de Menthe to create curls. Add the curls to the top of the cocktail and serve.