Black Forest cake (American English) and Black Forest gateau (British English) are the English names for the southern German dessert Schwarzwälder Kirschtorte (literally “Black Forest cherry torte”).
Typically, Black Forest cake consists of several layers of chocolate cake, with whipped cream and cherries between each layer. Then the cake is decorated with additional whipped cream, maraschino cherries, and chocolate shavings. In some European traditions sour cherries are used both between the layers and for decorating the top. Traditionally, Kirschwasser is added to the cake, although other liquors are also used (such as rum, which is common in Austrian recipes). In the United States, Black Forest cake is most often prepared without alcohol. (source: Wikipedia)