Noodles: Bring a pot of water to a boil and cook the noodles according to the package instructions. When just al dente, drain but do not rinse. Transfer them to a large serving bowl. If desired, toss with a small drizzle of oil to prevent clumping. You can keep the noodles in a warm (unheated) oven while preparing the soup.
Shiitake: Slice the shiitake caps into bite-sized pieces.
Make soup broth: In a medium saucepan, combine the chicken stock, water, and shiitake. Season with soy sauce, salt, and fish sauce. Bring to a boil over medium-high heat, about 5–6 minutes, until the mushrooms are tender and the broth is well seasoned
Eggs: Meanwhile, crack the eggs into a small bowl. Place a sieve over a large measuring cup with a pouring spout. Pour the eggs into the sieve and use a wooden spoon to gently press them through in a circular motion, helping the eggs pass evenly through the sieve. This creates a finer, silkier texture than simply whisking. Set aside.
Make egg flower: Once the broth reaches a rolling boil, turn off the heat. Slowly and evenly stream the strained eggs into the hot broth from slightly above the pot in a circular motion without stirring. Let the eggs sit undisturbed for a few seconds so delicate ribbons can form.
Garnish: To complete the soup, garnish with scallions, drizzle of sesame oil and a few rounds of ground black pepper.
Serve: Ladle the hot soup over the prepared noodles. Garnish with scallions, a drizzle of toasted sesame oil, and freshly ground black pepper. Serve immediately.
Notes
Use a sieve with medium-sized holes when straining the eggs. If the mesh is too fine, it will take much longer for the eggs to pass through.
Cooking the noodles separately keeps the broth clean and clear by preventing excess starch from clouding the soup.
If timed well, you can cook the noodles while preparing the soup to save time.
This recipe is designed as a quick single-serving meal. It can easily be doubled for two servings.
Storage and reheat: Store broth and noodles separately for best texture. Reheat the broth gently, then assemble just before serving. The egg ribbons will firm up slightly when reheated, but the flavor remains good.