Arsik fish is a traditional dish from North Sumatra. The basic ingredient of the dish is carp fish. The dish is often served in a certain celebration, thus there is an etiquette in serving the dish. What makes the dish unique is the use of spices which only can be found in north Sumatra, namely Andaliman and Cikala tamarind.
Source of the pic: http://www.resepnasional.com