Röda Ulven is Sweden’s leading brand of traditional fermented Baltic herring (surströmming), produced by Gösta Hannells Fisksalteri in the fishing village of Skagshamn, Arnäsvall. This delicacy, known as one of the most pungent foods in the world, is fermented in lightly salted water for at least six weeks - often much longer - developing an intense, sour-salty flavor and a distinctive aromatic profile.