From late August to early September, a stinky tradition has been preserved since the 1800s – especially in the north. Fermented sour Baltic herring
(surströmming) is still a very popular tradition in Sweden – specifically in northern Sweden. A delicacy that used to be necessity for peasants finds friends and family gathering to feast on these stinky fish. Due to the unpleasant odor of rotting fish many of these parties take place outdoors. Traditionally, it is eaten in a sandwich with thin bread, diced potatoes, chopped onions and sour cream. The surströmmingspremiär (Sour Herring premier) in Sweden takes place the third Thursday of August each year.