Spicy cold fish soup (mulhoe 물회 in Korean) that is served on Jeju differs from versions on the mainland.
The ingredients may include uncooked soybean paste and a special fermented barley vinegar.
Both of these ingredients were most commonly used on Jeju because they were plentiful and durable on an island that was once relatively barren and harsh.
Bonus: Here’s a fun cartoon series called "Old Dog" which details mulhoe (scroll down a bit).
As for the raw fish, you can choose between mitra squid (hanchi), damselfish (jari), and even abalone and tilefish (okdom) among others.
The julienned carrots and cucumber really bring a crispness to the meal along with the ice cubes. It’s the perfect dish in summer!
Please note: Due to the COVID-19 crisis, many of Jeju’s seasonal festivals and tourist destinations have closed. Meanwhile, though, we would like to highlight some of the island’s culinary attractions. We sincerely hope you will visit Jeju once the crisis has passed.
Jeju Tourism Organization Travel Blog 