Wash the soup meat and cook in approx. 2 litres of boiling, slightly salted water for approx. 2 hours. Wash the ginger and cut into thin slices. Season stock with star anise and ginger. Clean the onion, cut in half across the flower and root and fry in a pan without fat at medium heat for about 10 minutes until dark.
Clean the soup greens, peel if necessary, wash and cut into pieces. Add soup vegetables and onions to the meat about 1 1/2 hours before the end of the cooking time. Prepare noodles in boiling salted water according to package instructions.
Wash the fillet of beef, dab dry and cut into very thin slices. Wash the bean sprouts. Clean and wash spring onions and cut into very thin rings. Wash herbs, shake dry and, except for something to garnish, pluck leaves from the stems and chop.
Pour stock through a sieve, use the soup meat for other purposes. Wash lime hot, grate dry, halve fruit. Squeeze one half, cut the other half into slices. Season stock with soy sauce, lime juice and pepper, bring to the boil.
Drain the noodles in a sieve and let them drain. Arrange noodles, vegetables, herbs and meat in soup bowls and pour over the hot broth. Garnish with lime and remaining coriander.