Rumaki is an hors d'oeuvre of mock-Polynesian origin. It was most likely invented by Victor Bergeron, known as Trader Vic. Its ingredients and method of preparation vary, but usually it consists of water chestnuts and pieces of duck or chicken liver wrapped in bacon and marinated in soy sauce and either ginger or brown sugar. Pastrami is often substituted for bacon when rumaki is prepared for kosher diners who avoid eating bacon.
The earliest known reference to it is on the 1941 menu of the Don the Beachcomber restaurant (Palm Springs).