In a food processor, pulse seafood until mixture is well chopped, but not pureed. Transfer to a bowl. Separate dough into individual sections. Flatten each roll. Place 1 tablespoon of the mixture in center of the dough. Gather edges and press to seal. Place buns in a steamer and let cook for 8 to 10 minutes until the dough has puffed up and is cooked through.
To make the dipping sauce, combine the soy sauce and vinegar. Serve with the steamed buns.
Recipe courtesy of Hyungshin Song