
This Lanzhou-style beef noodle soup is built on a deeply savory broth made with beef bones, beef shank, chicken, and warm spices. Served with tender noodles, sliced beef, radish, fresh herbs, and fragrant chili oil, it is a rewarding homemade noodle soup for a cozy dinner or weekend cooking project.
Heat the oven to 400°F. Rinse the soup bones and pat them dry, then spread them on a baking sheet and roast for 45 minutes until well browned. Meanwhile, bring a large pot of water to a boil, add the beef shank and chicken, and boil for 2 to 3 minutes to remove impurities. Drain, discard the water, and rinse the pot clean.
Return the beef shank and chicken to the clean pot. Add the roasted bones, 10 cups water, and 4 cups chicken stock. Combine the star anise, cinnamon stick, bay leaves, sand ginger, fennel seeds, cumin seeds, Sichuan peppercorns, white peppercorns, licorice root, dried orange peel, and black cardamom in cheesecloth and tie into a secure spice pouch. Add the pouch and season the broth with salt.
Bring the pot to a boil, then reduce to a gentle simmer. Cook for about 2 hours, skimming the surface as needed for a clear broth. Remove the beef shank and let it cool enough to slice later.
Add the sliced Chinese radish to the broth and continue simmering for 1 more hour, or until the radish is tender and the broth is rich and aromatic. Discard the bones, chicken, and spice pouch. Taste the broth and adjust the seasoning with more salt if needed.
To make the chili oil, warm the oil in a small saucepan over very low heat with the extra star anise, small cinnamon stick, and extra Sichuan peppercorns for about 15 minutes. Remove the whole spices, let the oil cool for 5 minutes, then stir in the crushed red pepper flakes. Let the chili gently bloom in the hot oil until deeply red and fragrant, then stir in the sugar and a pinch of salt if needed.
Cook the noodles in a separate pot according to the package directions, then drain. Divide the noodles among 6 serving bowls. Thinly slice the cooled beef shank and arrange it over the noodles.
Ladle the hot broth and radish over each bowl. Finish with a spoonful of chili oil, chopped scallion, and cilantro. Serve immediately while hot.
If sand ginger or licorice root is hard to find, you can still make a flavorful broth by omitting them, though the soup will be less traditional. The broth can be made 1 to 2 days ahead and refrigerated; remove any solidified fat before reheating. Do not let the broth boil hard during simmering, or it may turn cloudy.