Gammalost, cheese of the Vikings.
Quote from site: I remember asking my great uncle Arthur how Gammalost was made. His tale was something like, take some cheese, stuff it in an old sock bury it in the manure under the barn and when it is ready it will crawl out. Some Gammalost smells like his recipe could be true, but Gammalost today does not smell strong. Arthur did say you could eat Gammalost instead of taking pennicillin.