Cut the white part of 1 Japanese leek (naganegi) into 5-6cm pieces (2 inches). Cut lengthways through to the middle and remove the cores.
Press the layers of negi flat on the chopping board and slice lengthways as thinly as possible.
Place the shredded negi in a bowl of ice-cold water and soak for 5 minutes.
Drain and shake thoroughly to remove any excess water.
Take a mixing bowl and add ½ tsp chili bean sauce (toban djan), ½ tsp Chinese-style chicken bouillon powder, 1 tbsp toasted sesame oil, 1 pinch salt and pepper and ⅛ tsp Japanese chili powder (shichimi togarashi). Mix thoroughly, then add the negi and mix until evenly coated.