I'm glad everyone has enjoyed the piggy cake picture.
I have found another, with
a recipe, and directions.
A friend sent me a note on facebook to say that the original was apparently posted on a German FB page and the top is supposed to be Nutella which is more "mud-colored" than chocolate.
However that depends on where you live. In Georgia the mud is red while in Wisconsin it is almost black.
Also, apparently piggy cakes are very popular.
Here is a link to many pig-themed cakes.