Pre-heat the oven to 220C/425 degrees F/ Gas Mark 7.
First you need to line a large roasting tray with the banana leaves. You do this by holding them over the hob so the whole leaf is warmed and softened (this makes it more pliable) and placing them in the tray so there is a large piece overlapping on all sides. You need to make sure there are no gaps. Sprinkle over the chili, coconut, ginger and coriander, then place the cod, skin side up, on top.
Drizzle with olive oil, season with sea salt and squeeze the lime juice over the top. Place the squeezed limes in the tray.
Fold the banana leaves over the fish to seal, and place something heavy and ovenproof on top to keep in place.
Place in the middle of the oven and cook for about 25 minutes.
When the fish is ready, remove the skin from each fillet and serve on warmed small squares of banana leaf, spooning over all the delicious juices, with a little cooked rice and a sprinkling of fresh coriander leaves.
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c. Jamie Oliver 2003