A bracingly cold Korean raw fish soup from the east-coast fishing towns: thin slices of sashimi-grade white fish tossed with crisp pear, cucumber and perilla in a sweet-sour chogochujang, then flooded with iced water. Eaten with a spoon and chopsticks, and finished with cold somyeon noodles to soak up the last of the broth.
Put a deep serving bowl in the freezer to frost. Pat 120 g of sashimi-grade flounder completely dry, then slice it against the grain into thin bite-sized strips about 5 mm thick. Spread the slices on a plate, cover, and set over a tray of ice in the fridge while you prepare everything else, the fish must stay ice-cold and firm.
Cut 60 g of cucumber, 50 g of peeled Korean pear and 20 g of carrot into fine matchsticks 5 cm long. Stack 2 perilla leaves, roll them and shred finely, and slice 1 spring onion on a slant. Keep the vegetables in the fridge so they stay crisp.
Make the chogochujang: whisk 1.5 tbsp gochujang, 1 tsp gochugaru, 1.5 tbsp rice vinegar, 2 tsp sugar, 1 tsp soy sauce and 1 grated garlic clove in a small bowl until glossy and smooth. Taste, it should be sharply sour and sweet, stronger than you want the finished soup, since the iced water will dilute it. Chill for at least 10 minutes.
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