Here's how to do it:
Equipment: Cocktail shaker, strainer
Ingredients: 2oz gin, ½ oz Green Chartreuse, 1/2oz lime juice
Do this for 1 drink:
Fill a cocktail shaker with ice. Add gin, Chartreuse, and lime juice. Shake until well chilled, about 15 seconds. Strain into cocktail glass and serve.
Adapted from a recipe here.