1. Place four pieces of foil on a flat surface. Top with a piece of baking paper cut a little smaller than the pieces of foil.
2. Place fish in centre of each piece of baking paper. Divide lemon, tomatoes, capsicum and olives over fish. Season with salt and pepper. Fold foil over to enclose fish. Fold in ends tightly to form a parcel. Place parcels on an oven tray.
3. Cook parcels in a hot oven (200C) for about 15 minutes, or until fish is cooked through. Carefully open parcels to allow steam to escape. Dot with butter.
4. Serve fish garnished with fresh basil.

Tip: Serve fish with steamed rice or mashed potato to soak up the cooking juices. For a change, chicken breast fillets can be substituted for the fish fillets. Increase cooking time by 10 minutes, depending on the size of the chicken fillets.