Van Dusen Cocktail

Ingredients:
4 fluid ounces or 12 centilitres of Gin
2 fluid ounces or 6 centilitres of Martini and Rossi Extra Dry Vermouth
Drop of Grand Marnier
2 fluid ounces or 6 centilitres of Martini and Rossi Extra Dry Vermouth
Drop of Grand Marnier
Instructions:
Stir in a highball glass.
