All you have to do is make your favorite chocolate cake recipe. Torte (split horizontally) the cake so that you have 4 layers of cake. Make your favorite chocolate mousse recipes (I'm guessing a dark chocolate, a milk chocolate, and a white chocolate?) and layer cake, mousse, cake, mousse, cake, mousse, cake. You can then ice using a poured ganache or whipped cream (depending on how rich you want the cake to be). You can also make the flavors more complex by brushing a liquor-syrup onto the cake layers, such as a Godiva chocolate liquor, rum, Grand Marnier, Kahlua, etc.
Dobosh Tortes:
http://forum.cakecentral.com/cake-decorating-ftopict-48160-.html
HTH
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