This cocktail Brandy Alexander is made from Crème de Cacao ambré Briottet, a cocoa liqueur with a touch of vanilla. Only two other ingredients are required: Cognac and Cream.
The first version of Brandy Alexander was born of necessity, gin was its base spirit, Prohibition required sweet and soft ingredients to hide the poor quality of illegaly distilled spirits. It then evolved with the tastes of its time, gin got replaced with cognac.