Moules-frites or Mosselen Met Friet or Clams with fries is a popular dish in Belgium and the north of France. It is considered one of the national dishes of Belgium.
The dish consists of mussels cooked in salted water with vegetables including celery and onion. Along with a portion of fries. In Belgium, the mussels are prepared in special black enameled mussel pots and served with Belgian fries. Per person is an average of one kilo of mussels is needed. The fries are usually eaten with mayonnaise or mussel sauce made of a cocktail of mayonnaise and mustard.