Heat oven to 200°C/ 180°C fan/Gas Mark 6. Cut 4 pieces of nonsstick baking paper about a4 size. Lay each of these on a piece of foil that is slightly larger. Divide the courgette between the 4 sheets placing it towards one end of the paper, lay a piece of fish on top then follow with tomatoes and olives then finally a few slices of garlic. Add a squeeze of lemon then fold the empty end over to contain the fish. Fold the joining edges to seal the parcel, so no steam can escape. Lay on a large baking sheet and cook for 20 minutes.
Meanwhile make the basil oil, put the basil and oil in a pestle and mortar with some seasoning and bash until combined. Remove the cod parcels from the oven and serve with a spoon of basil oil and some steamed new potatoes.
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