Bass en Papillote

Method

1. Preheat oven to 400°F. Cut 4 large pieces of parchment paper. Fold each in half and cut into a heart shape.

   A properly preheated pan is non-negotiable. If the oil doesn't shimmer and a drop of water doesn't sizzle on contact, the pan isn't ready. Cold pans cause sticking and prevent browning.

2. Build the packets. On one half of each heart, layer zucchini slices, cherry tomatoes, and olives. Place a sea bass fillet on top. Season with salt and pepper. Top with a lemon slice and basil sprig. Drizzle with 1 tablespoon olive oil and 1 tablespoon wine.

3. Seal the packets. Fold the other half over. Starting at the top, fold the edges over twice in small, tight crimps. Twist the pointed end to lock.

   Fold gently to preserve the air you've incorporated. Use a large spatula, cut through the center, and sweep along the bottom and up the side. Overmixing deflates the mixture.

4. Bake for 14–16 minutes until the packets are puffed and golden.

   Position the rack in the center of the oven for even heat distribution. The top rack runs hotter (closer to the heating element) and the bottom rack is cooler.

5. Serve in the packet. Place on plates and cut open at the table. The fragrant steam is part of the presentation.

   Serve immediately while the textures and temperatures are at their peak. Most dishes begin declining the moment they leave the heat — crispy things soften, sauces thicken, and aromatics fade.

Equipment

• Parchment paper Recommended: Reynolds Kitchens Parchment Paper Roll
• Rimmed sheet pan Recommended: Nordic Ware Natural Aluminum Half Sheet Pan
• Scissors

Chef Notes

• The most important thing: Seal the parchment packets tightly — the steam trapped inside is what cooks the fish. Fold the edges over twice and crimp firmly. If the seal leaks, the steam escapes and the fish dries out.
• The vegetables go on the bottom, fish on top. The vegetables release moisture that steams the fish from below. Zucchini and tomatoes are ideal — they cook in the same time as the fish.
• Sea bass is a premium fish with firm, buttery flesh that holds up beautifully to steaming. It doesn't fall apart like more delicate fish.
• Don't open the packet to check. Trust the timing: 14–16 minutes at 400°F for 1-inch fillets. The packet puffs up when the steam builds — that's your visual cue.
• This is Provençal cooking at its simplest — fish, vegetables, olive oil, and herbs in a sealed packet. The flavors concentrate and meld inside the parchment.

Common Substitutions

Ingredient	Substitution	Notes
Sea bass	Cod, halibut, or snapper	Any thick white fish
Parchment	Aluminum foil	Easier to seal, less elegant
Zucchini	Asparagus or fennel	Different vegetable, same technique
White wine	Lemon juice	More acidic, less complex
Niçoise olives	Capers	Different brininess

What You're Practicing

Bass en papillote teaches you parchment steam cooking — sealing protein and vegetables in a packet to cook gently in their own juices. This is one of the most forgiving fish techniques and produces perfectly moist results every time. Visit Techniques for more on en papillote.

You're also learning Provençal flavor building — combining olive oil, tomatoes, olives, and herbs into a Mediterranean flavor base. These ingredients are the backbone of southern French cooking. Explore more at Techniques.