Place a large sheet of baking paper or foil onto a baking tray and place leeks onto the bottom half. Set aside.
Place all marinade imgredients into a bowl and mix well
Place fish on top of leeks and, using a sharp knife, score the fish by making vertical cuts 5cm apart along the length of the fish, from head to tail
Spoon some of the marinade in betweenthe betterflied fish and pour the rest over the while fish, making sure tospoon some into the cuts that have been made
Season with freshly dround black pepperBring the edges of the baking paper together and fold to forma sealed parcel
Bake in the oven for 30-40 minutes or until the fish is cooked
Serve with steamed coconut rice and wedges of fresh lime