What New Year's Eve meal in Denmark traditionally includes eating cod with mustard?

New Year's cod traditionally includes eating cod with mustard in Denmark.

Cod with mustard is a traditional Danish New Year's Eve dish. It is often served as part of a festive meal alongside other foods and drinks, and the dish is especially associated with older Danish culinary customs. The exact menu varies between households, so it is not a fixed national course served identically everywhere.

Danish New Year's celebrations also include several distinctive customs. At midnight, people may jump from a chair or sofa into the new year, while the Danish royal family's New Year's address is an established broadcast tradition. Fireworks and sparkling wine are also common parts of the evening.

The cod dish can be confused with Denmark's many everyday seafood preparations, including pickled herring. The specific New Year's association in this question is cod served with mustard, rather than herring or salmon.