Mussels or moules are the national dish of Belgium & in season from September to February that come from the North Sea, off the northern coast of the Netherlands. Traditionally they are served in a large steaming pot of savoury broth with a side Belgian frites and homemade mayonnaise.
The most common method is a la marinere, which consists of white wine, shallots, parsley and butter. However you ll see many other recipes, like replacing the white wine with delicious Belgian beer.
Mr husband told me a story how this mussels are cleaned up by workers there in a factory in Morocco cause of the high salary of workers in here. So, the mussels need to travel from Netherlands/UK/Belgium to Morocco and need to return to the markets in their original countries in less than 4 hours to keep them still fresh.