1 & 1/2 fluid ounces or 4.45 centilitres of Gin
1 fluid ounce or 3 centilitres of Triple Sec
Dash of Bitters
1 Teaspoon of Blue Curacao

In an old-fashioned glass almost filled with ice cubes, combine the gin, Triple Sec, and Bitters. Stir well. Pour the Curacao into the centre of the drink.