A very moist chocolate cake due to the mayonnaise base, with a very rich frosting. The name of the cake comes from the story that somebody (I think around the turn of the last century) supposedly paid $100 to a restaurant in Chicago for the recipe--equivalent to paying several thousand dollars today. The story is widely known but I don't know whether it's fact or fiction. I myself don't like chocolate, so when I have to make a dessert and don't want to be "tempted" I like to make something chocolate. Therefore I haven't eaten it myself. However, a number of people I've served it to have asked for the recipe so I feel confident that it's quite good.