ˈrōlˌmäps noun
( plural rollmops “ ; also rollmop·se -sə)
Etymology: German, from rollen to roll + mops simpleton, pugnosed dog, from Low German — more at roller , moppet
: a fillet of freshened salt herring rolled up with pickle or onion and skewered and then pickled in a marinade of vinegar, sliced onion, peppercorns, celery seed, bay leaves, or other spices