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Heat oven to 200C/180C fan/gas 6. Place each fillet in the centre of a large square of foil. Top with the pak choi, spring onions, chilli and ginger, then pull up the edges of the foil.
Mix together the soy sauce, lime juice and 1 tbsp of water then spoon a little over each fillet. Crimp the top of the foil to enclose the fish and make sure there are no gaps for the steam to escape.
Place the parcels on a baking sheet and bake for 10-15 mins until the fish is cooked through (this will depend on the thickness of your fish). Open up the parcels and drizzle over a few drops of sesame oil. Serve with rice.