This is a fairly old cocktail (very early 1900s). Although, in those days, Old Tom Gin was used. Today, it is your normal London dry gin. Fairly close to a martini, this is made from gin, yellow chartreuse and orange bitters. Fairly complex in the nose and the finish (the yellow chartreuse plays a dominant role), it is somewhat citrusy to the palate and leaves a strong impression on you.