Rinse the acorn jelly thoroughly and cut into bite-sized pieces.
Julienne the cucumber, carrot, and onion.
Make the sauce by mixing gochujang (Korean chili paste), soy sauce, vinegar, sesame oil, sugar, garlic, and sesame seeds.
Add the sauce to the acorn jelly and vegetables, then mix well.
Plate and top with seaweed flakes and sesame seeds to finish.