Add the cornflour and 1 tablespoon of soy sauce and 1 tablespoon of Chinese cooking wine to the beef strips. Combine well and leave for 15 minutes. This is to velvet the beef so it is tender rather than chewy.
Put a large pot on the hob [stove], then add the beef stock, soy sauce, star anise, garlic, ginger, five spice, half the spring onions, and half the chilli, then simmer on low heat for 15-20 minutes. This will let the flavours develop and infuse.
When you're ready to serve. Heat the oil in a wok or large frying. Add the beef strips and stir fry for 2 minutes until the beef is brown on the outside. Try not to overcook the beef, you want them to be as tender as possible. Put to one side.
Get some large bowls and divide the noodles. Then add the beef strips, sprinkle on top the coriander, the rest of the spring onions and the chopped chilli.
Then ladle the beef broth into the bowls over all the ingredients.
Drizzle chilli oil on top and serve immediately.