My go-to for any fish is to line a large piece of tinfoil with a sheet of greaseproof paper, dot the greaseproof paper with butter - and lemon slices if you have any - to make a sort of bed. Place the fish on top, season with salt and pepper (can also put a scattering of herbs if you like them). Add a drop of white wine and/or a good squeeze of lemon juice. You can also add more dots of butter on top. Then wrap the greaseproof paper round it into a parcel, then wrap the foil round the greaseproof to make a neat parcel, making sure that no steam will escape as it cooks. Place the parcel on a baking tray/sheet and cook in the oven. Now, I’m afraid this is where I come a bit unstuck as to temperatures, as we have a Rayburn, so it just goes in for about 20 minutes at whatever the Rayburn is on at. Usually about 400F. The secret with fish is not to let it dry out and not to overcook it. We often have lovely fresh fish courtesy of our son.