A national dish is a culinary dish that is strongly associated with a particular country. A dish can be considered a national dish for a variety of reasons:
It is a staple food, made from a selection of locally available foodstuffs that can be prepared in a distinctive way, such as Fruits de mer, served along the west coast of France.
It contains a particular 'exotic' ingredient that is produced locally, such as the South Americanpaprika grown in the European Pyrenees.