2 (1.5 fluid ounce) jiggers dry gin
1/4 (1.5 fluid ounce) jigger dry vermouth
1 drop anise flavored liqueur, such as Sambucca®
1 pitted green olive
Fill a martini pitcher with ice. Pour in the gin, vermouth and anise liqueur. Stir or shake until extremely cold. Strain into a chilled martini glass. Garnish with an olive.