When purchasing fresh Mussel from Galicia, remove the mussels from their package and wash it. With a splash of cold water is sufficient, as Mussel from Galicia in the market meets the required sanitary conditions. The more you wash, more lose their characteristic flavor of the sea.
You may find some hard adhesions in their shells, but there is no need to delete them, they are part of the natural habitat of the mussel, and cooking does not transport you taste or smell different.
Once cleaned, should be stored in a cool place, preferably in the refrigerator until the time of preparation.
Depending on the culinary presentation and consumer choice can make the byssus (filaments secreted naturally mussels to attach to substrate).
-Do not wash too much
-No scrubbing or scratch hard shells to remove adhesions
-Remove the byssus as chosen