2 1/2 ounces London dry gin
Splash of French dry vermouth
Olive, chilled, for garnish
Chill a V-shaped martini glass in refrigeration or by filling with ice and water.
Fill a large glass or cocktail shaker with ice. Add gin and vermouth. Stir with a long bar spoon for approximately 20 seconds, until the liquids are thoroughly chilled and the ice has started to melt.
Strain into chilled glass; add chilled olive and serve.