Can I use parchment paper instead of foil?

The answer

Yes. Parchment works well for papillote-style parcels and for lining a tray, and it does not react with acidic ingredients such as lemon juice or tomato. It gives a gentler steam and an attractive parcel at the table. Fold the edges in tight, overlapping pleats to hold the seal, and place the parcel on a tray. For high-heat browning, parchment is a lining, not a lid.