Ladle into bowls, sprinkle with the coriander and serve. This soup bowl can be made up to a day ahead – add the noodles and bok choi just before serving. It is not suitable for freezing.
Mung bean noodle sheets are brittle and too large to fit into most bowls. But don’t break them up so they fit: just pour boiling water over them and, with a little time, they’ll be soft and ...