Preheat the oven to gas 5, 190°C, fan 170°C, or wait until the embers of the fire are nicely white-hot. Cut out 6 rectangles of foil big enough to enclose the fish and brush a side of each with the oil.
Dissolve the coconut in 120ml (4fl.oz) hot water. Put a salmon fillet in the middle of the oiled side of each piece
of foil. Raise the edges to create a bowl, then divide the lime zest, lemongrass, chilli, soy sauce and coconut liquid between each parcel. Scrunch the foil to make sealed parcels.
Put the parcels on a tray and bake for 12-15 minutes.
If cooking on the bonfire, put the parcels in the embers and cook for 15 minutes. Serve in the foil parcels or plate up with lime wedges and rice.
Freezing and defrosting instructions
Can be kept in the freezer for up to 3 months. Always defrost and heat thoroughly before eating. Never re-freeze food that has already been frozen; this includes raw and cooked ingredients such as meat, fish and poultry.