Vivda is an ancient Viking dish of preserved mutton. The meat, usually leg, is hung in a ventilated stone house known as a Skeos near the sea shore, for between four and six months where it comes into contact with salt in the air. After hanging the meat becomes encrusted with moulds and yeasts, which are scrubbed off with salt water before the meat... Found on http://www.probertencyclopaedia.com/browse/QV.HTM