The famous Belgian mussels with fries (mosselen met frietjes). Mussels are a firm favorite and a side-dish of Moules et frites/Mosselen met friet (Mussels with French fries). The traditional way is to cook them in a pot with white wine and/or oignons and celery, then eat them up using only a mussel shell to scoop them out. The top season is September to April, and as with all other shellfish, do not eat the closed ones. Belgium's mussels always come from the Netherlands earby. Imports from other countries are looked down on.