Awesome Foil Envelope Fish

This is the foil-pack version of French en papillote, the technique where fish steams in its own juices alongside vegetables and herbs. White fish fillets sit on a bed of green pepper, tomato slices, and scallions, get topped with lemon slices and basil, then sealed in foil and baked. The packet puffs as the steam builds and the fish stays moist while every flavor concentrates inside the envelope. Open it at the table for a small theatrical reveal that makes a weeknight dinner feel like restaurant cooking.

The technique is actually clever. The vegetables release water as they cook, creating steam that gently poaches the fish without drying it. Lemon juice and oil from the basil meld into a light pan sauce that pools in the foil and goes onto the plate when you cut the X to open the packet. Use a flaky white fish like cod, tilapia, or sole. Thicker, oilier fish like salmon work too but need a few extra minutes.

Pro Tips

• Seal the foil edges tightly with a double fold. Loose seams let steam escape and the fish dries out.
• Use thin slices of vegetables. Thick chunks won’t soften enough in the short cooking time.
• Test for doneness by pressing the foil. The fish should feel firm and the packet should be puffed and steaming.
• Open the packet carefully at the table. The escaping steam is hot and the aroma is the whole point.

Variations

• Use salmon, trout, or halibut for a richer fish.
• Add capers, olives, or sliced fennel for a Mediterranean spin.
• Substitute soy sauce, ginger, and scallions for an Asian-inflected packet, served over rice.