A deeply aromatic, slow-simmered bone broth perfumed with charred ginger, star anise, and cinnamon, ladled over silky noodles and fresh herbs.
Simmer the chicken stock with charred onion and ginger for 20 minutes, then strain.
Add the chicken thighs and simmer for 25 minutes until tender; remove, shred, and return the meat to the broth.
Drop in the asparagus and cook for 3 minutes until just crisp-tender.
Stir in fish sauce and adjust with white pepper.
Divide vermicelli between bowls, ladle over the soup, and finish with coriander and lime.