I have never had moules frites, so I wanted to go to les Halles and try some out. On menupages they list about 7 varieties w/different sauces (marinara, normande, billi bi (?), etc.)...which ones are your favorites?
BTW I picked les Halles because I remember it being recommended a couple of times, but I am definately open to any other places if you think they have better food ^-^.