Tune the sesame paste texture: slightly add light soy sauce, sesame oil, salt and cold water in sesame paste. Stir to combine well. The sesame paste should be running but not thin.
Cook the noodles
Set up a steamer with enough water and bring to a boiling.
Spread noodles on a steamer and then steam for 4-5 minutes. Then add a small pinch of salt in the water and then transfer the noodles in the water. Heat until the water boils again.
Transfer out and add ½ tablespoon of oil immediately (This will help to avoid the noodles being sticky with each other). Stir to mix well. Use chopsticks to stir the noodles up repeatedly to help the noodles cool down quickly. In hot days, you can even resort to an electric fan.
Assemble the noodles by each serving (we can make 3 this time)
Mix with all the other serving ingredients. Garnish some chopped scallion, coriander, Zha cai, chili oil, freshly ground Sichuan peppercorn and toasted peanuts.
Notes
You can cook the noodles in one batch. But seasonings should be mixed just before serving.