Chill your martini glasses in the freezer for at least 20 minutes before mixing this drink. Put at least 8 ice cubes in a martini shaker. Add four ounces Bombay Sapphire Gin and two ounces Extra Dry Vermouth. Cover and shake until the shaker is so cold that it hurts your hands and you can't hold it anymore, then strain into your chilled martini glass. Skewer two or three cocktail onions and nestle them into your drink. Drink it cold. The ten aromatic botanicals in Sapphire conspire to cool and soothe you. Very smooth and refreshing on a hot day.