If you’re using the soup as a light drink, turn the soup off, let it cool for 5 minutes and then stir in the miso and coriander and enjoy.
If you want to enjoy the soup as a more filling lunch, add the noodles to the soup and simmer as per packet instructions before adding the shredded cabbage and tofu for the final few minutes. Then turn the soup off for 5 minutes before stirring in the miso and coriander.