Sometime earlier in the year, Martha Stewart made one on her program and here's a link
to her recipe. The cake looked delicious and I haven't had the taste of one, but after looking at the program and the recipe, I think I'll need to make one. At least this recipe gets you started.
I also did a search on this site and discovered this recipe
. I didn't compare this to Martha's but you can, at least, get some direct feedback from the member who posted it.