Eric Hart's Prop site always has a neat weekly collection of links and tutorials, and his how-to on building a fake dead lamb, which has sections that can be edible, is tops in my book.
It's the perfect thing for any horror film or haunted house attraction. Hell, I can even see this being modified for a zombie or cannibal movie.
Go here for full instructions.
(Warning: Some of the pics seen in the tutorial may be upsetting to animal lovers and even be considered NSFW just for its sheer gore factor)