The fermentation process carries on during the can – 'souring' as the Swedes confer with it – and leads to a bulging tin of fermented herring. Or rotten fish, as some (incorrectly) would say. Whether you like it or despise it, Swedish surströmming is undoubtedly extremely unforgettable. The whole world’s https://www.youtube.com/watch?v=OS365DWxnKQ