IBA official recipe includes:
Components
50 ml – Vodka
20 ml – Coffee Liqueur
Preparation
Pour the ingredients into an old fashioned glass filled with ice cubes. Stir gently.
* Notes – Standard garnish – Lemon slice and a Luxardo maraschino cherry on a stick.
Enjoy ! ADB
This drink, first appeared in 1949 and is ascribed to Gustave Tops, a Belgian barman, who created it at the Hotel Metropole in Brussels.