Gentleman's Cocktail

Ingredients:

1 & 1/2 fluid ounces or 4.45 centilitres of Bourbon Whiskey
1/2 a fluid ounce or 1.5 centilitres of Brandy
1/2 a fluid ounce or 1.5 centilitres of Creme de Menthe
Club Soda

Instructions:

Stir over ice in a highball glass. Garnish with a lemon twist.