Heat your oven to 400F/205C
Take a large piece of alumium foil. Place the foil in front of you and cover with a piece of baking paper.
Place the fish in the center of the baking paper.
Season the fish to taste on both sides.
Place around the veggies and drizzle all with olive oil. Season the veggies to taste and sprinkle with parsley. If using lemon, top the fish with lemon slices
Lift the ends of the alumium foil, along with baking paper. Fold the sides to seal the top slitz. Fold over the foil on the both sides, and close the fish within the parcel. Place the parcel in a baking dish.
Bake the fish for 25 minutes.
Allow to cool for 5 minutes before opening as the steam may burn you.
Serve fish with veggies, lemon, and any cooking juices.