Make the alkaline noodles (jian shui mian):
- Thoroughly dissolve the soda ash and salt in the water. Pour the solution into the bread flour and mix until well distributed.
- Knead using a stand mixer for 10 minutes on low, or by hand for 10 minutes until smooth.
- Divide the dough into three even parts and flatten each so it fits through a pasta roller.
- Start on the thickest pasta-roller setting and feed the dough through. Fold in half and feed through again, repeating 3-4 times until the sheet is smooth. Do this for all three pieces.
- Lower the thickness one level at a time and feed the sheets through until the desired thickness (about level 4 on a KitchenAid roller).
- Apply a generous amount of cornstarch to prevent sticking. Switch to the noodle-cutter attachment and cut uniform noodles.
- Coat the noodles with more cornstarch to prevent sticking. Cover and set aside. (Cornstarch, being gluten-free, separates the noodles longer than wheat flour.)
Make the Seasoned Sweet Soy Sauce (Fuzhi Jiangyou):
- Add all the seasoned sweet soy sauce ingredients to a sauce pot. Bring to a boil, then simmer on low without a lid for 20-30 minutes, until about 2/5 of the liquid has evaporated.
- Sieve out and discard the spices. Store the extra sauce sealed for up to 6 months at room temperature.
Make the red chili oil (you po la zi):
- Add the Sichuan peppercorn powder, mild chili powder, spicy chili powder, raw sesame seeds, salt, and Chinese black vinegar to a big bowl. Mix well and set aside.
- Add the vegetable oil, scallions, ginger slices, garlic slices, cinnamon stick, star anise, and bay leaves to a sauce pot. Heat over medium heat until the aromatics are nicely charred, 4-6 minutes. Sieve and discard the aromatics.
- Optionally, put the Lithospermum root (zicao) on the sieve and swirl it in the hot oil for 20-30 seconds; it has no flavor but dyes the oil a beautiful purple-red.
- Use a thermometer: 400F/204C is ideal. Too hot and the spices burn; too low and the fragrance won't activate.
- Pour the hot oil into the chili flake bowl in batches, stir well, and let cool. Store extra sealed for up to 4 months at room temperature or a year in the fridge.
Prep the rest:
- For the seaweed soup, bring 4 cups chicken stock to a boil. Add the bean sprouts and seaweed. Season with salt and black pepper to taste.
- For the nut powder, blend the roasted pecans, peanuts, and sesame seeds into a rough powder. (If raw, bake nuts at 350F/177C for 14-16 minutes and sesame seeds for 12-14 minutes, then cool before blending.)
- For the garlic water, press the garlic cloves and mix with 1/4 cup water.
- Add the sui mi ya cai to a wok and stir over medium heat for 3 minutes to evaporate some moisture. Set aside.
Assemble one portion of flaming noodles:
- Cook the noodles in boiling water for 2-3 minutes until al dente. Remove and shake well.
- Place one portion of noodles in a big bowl. Add chili oil to taste (about 3 Tbsps), 1.5 Tbsps seasoned sweet soy sauce, 2 tsps garlic water, 1.5 Tbsps roasted nut powder, 2 Tbsps minced cilantro, 2 Tbsps minced scallions, and 2 Tbsps sui mi ya cai. Mix well. (Recipe makes 3 servings; repeat for 3 bowls.)
- Serve the flaming noodles with the seaweed soup.