Nice try!

Please excuse the reduced quality of this picture but - did You ever get so close to a living Alien??? Unfortunately this little monster moved away so fast that I couldn't even ask for it's name. I definitely know that it is not Alien III though! If You don't mind I suggest that You try again. Stay sober for the next guess!

Green Leaves

Pour 2 cl of Sirop de Menthe in a glass with crushed ice. Add some peppermint leaves and top it up with tonic water.