Looking at the pictures was a big mistake. Really big mistake.
The short version of the story is that a guy lost his foot and lower calf in an accident, and he decided to cook up his own meat and serve it to his friends. They all signed up for it willingly, and only one person had to spit it out.
You can read the interview on Vice without getting too grossed out, but when they warn you that the full set of photos are really, really graphic, know that they aren't kidding. Click through at your own risk.