Like köttbullar, knäckebröd, and smörgåstårta, this fermented fish is a legend within the nation's cuisine and is often considered one of the Swedish foods you need to try before you die. Despite its stifling fragrance, many Swedes wholeheartedly appreciate surströmming for its unique taste and cultural significance. It is even enjoyed at festive gatherings and on special occasions. Perhaps the most shocking aspect of surströmming, though, is that it cannot board aircraft with other luggage.