1Prepare the noodle dough by mixing flour and salt.
2Gradually add water and mix to form a shaggy dough.
3Let the dough rest for 20 minutes.
4After 20 minutes, knead the dough until smooth.
5Rest for one last time for 30 minutes
6Prepare the sauce by combining the white parts of the green onion, minced garlic, white sesame seeds, red pepper flakes, soy sauce, sugar, and Chinese black vinegar.
7Pour hot oil over the sauce and mix well.
8Divide the dough into two and work with one portion at a time.
9Roll out the dough to about 1 inch thick.
10Dust with flour generously.
11Slice/cut the dough with a sharp knife, about 3 mm (1/8 inch) thick.
12Dust the slices of noodles with more flour.
13Bring a large pot of water to a boil and cook the noodles for about 1 to 1 1/2 minutes. Do not overcook them.
14Rinse with fresh water to stop the cooking process.
15Toss the cooked noodles with the prepared sauce.