Top with a few coriander leaves and some of the sliced onion. Wrap fish first in the cabbage leaf, then make a parcel with the banana leaf. Fasten with short bamboo skewers or wooden toothpicks. Alternatively wrap in foil. Serve in the leaves.
Guests open their parcels on their own plates.
Serve a bowl of white rice alongside. Joint chicken and put into a saucepan with turmeric, salt, curry powder and just enough water to almost cover. Bring to boil then reduce heat, cover and simmer until chicken is tender. Cool, then discard bones and cut meat into small pieces. Cook thick coconut milk in a saucepan, stirring constantly, until it becomes thick and oil rises to the top.