In 2004, Peru's National Institute of Culture declared ceviche part of the country's cultural heritage, and the government later pushed the dish toward UNESCO recognition as specifically Peruvian. Peru also keeps a national holiday for it, June 28, Dia Nacional del Ceviche, and Lima's restaurant scene has spent two decades turning the dish into the country's best-known culinary ambassador. By any measure, Peru has claimed ceviche harder and longer than anyone else.
Ecuador did not concede the point. Ecuadorian cooks and food writers hold that citrus-cured seafood has its own independent lineage on their side of the old Inca coastline, pointing to a preparation that differs in ways too consistent to read as a simple copy: Ecuadorian ceviche is typically built on tomato juice, or a mix of orange and lime, rather than lime alone, served colder and soupier, often with popcorn or toasted corn (cancha) on the side rather than the drier, more citrus-forward Peruvian plate. The argument is not that Ecuador invented citrus-curing and Peru copied it, or the reverse; it is that both coastal traditions arrived at raw seafood cured in acid independently enough, and diverged in preparation distinctly enough, that treating one as the original and the other as a derivative or regional variant flattens two real culinary histories into one.
Both positions rest on a genuine difficulty: raw fish cured in acid, rather than cooked with heat, is not the kind of technique that leaves an archaeological trace the way a hearth or a grinding stone does. There is no citrus-stained pot to carbon-date. What exists instead is documentary and culinary evidence read two different ways by two national traditions that both, not coincidentally, have strong economic and cultural reasons to want the answer to go their way: ceviche tourism is real money and real identity on both sides of the border.
Nothing forces a resolution here, and nothing should be invented to manufacture one. Peru's claim is the internationally recognized one, backed by UNESCO's attention and a far larger diplomatic and tourism apparatus; Ecuador's claim is neither fringe nor sour grapes, but a standing position held by its own food historians and asserted in its own right. A dish can belong to a place's heritage without belonging to it exclusively, and ceviche, cured rather than cooked, resists the kind of single-point-of-origin story that a dish like pad thai, promoted by name from a single government office, simply cannot resist.