, the fermented shark that's Iceland’s countrywide dish. Surströmming is fermented herring and is particularly unique from fried or pickled herring. The answer lies in its fermentation procedure. The Swedish surströmming is not just salted like other kinds of herring; the surströmming is fermented with big amounts of lactic acid, https://www.youtube.com/watch?v=OS365DWxnKQ