Heat oven to 200C/180C fan/gas 6.
Cut a large rectangle of foil, big enough
to make a large envelope. Place the pak
choi on the foil, followed by the fish, then
the ginger and garlic. Pour over the soy
sauce and rice wine, then season.
Fold over foil and seal the 3 edges, then
put on a baking sheet. Cook for 20 mins,
open the parcel and scatter over the
spring onions and coriander. Serve with
brown rice and squeezed lime juice.