One type of fish, in particular, has become almost synonymous with Scandinavian cuisine: omega-3-rich herring. Specifically, pickled herring. In this Nordic-inspired lunch, the strong flavour of fatty herring is tamed when added to a tangy and sweet salad that is served on crispy crackers―Scandinavian cultures are also crazy for their rye. The salad can be stored in the refrigerator for up to 3 days. You can find jars of pickled herring in the seafood section of most supermarkets.