Can I use a different fish for the en papillote method?

Yes. Any mild-to-medium white fish fillet of similar thickness works: Lingcod (slightly firmer), Pacific Whiting (thinner -- reduce baking time to 12-15 min), Halibut Cheeks (very tender, similar timing), Chilean Sea Bass (richer and more buttery -- timing similar). For fattier fish like salmon, the method works well but increase baking time slightly and note that the cooking juices in the packet will be richer. The key is consistent fillet thickness for even cooking; if pieces vary significantly in thickness, fold the thin end under itself to equalize.

Can I assemble the parchment packets ahead of time?

Yes, with one important caveat: do not add the salt during advance assembly. Salt draws moisture from the fish via osmosis over time -- if salted hours before cooking, the surface of the fillet becomes wet and the texture slightly waterier after baking. Instead, assemble everything (lemon, onion, garlic, oil, herbs), refrigerate the assembled but unsealed packets, and add the salt and pepper just before sealing and placing in the oven. Assembled packets can be refrigerated up to 4-6 hours in advance.

How do I know when the cod in parchment is fully cooked?

Two indicators: (1) Visual -- open the packet carefully (hot steam) and test with a fork. The flesh should be fully opaque (no translucent or glassy areas) and flake easily along the natural grain lines. (2) Temperature -- an instant-read thermometer inserted into the thickest part of the fillet should read 145°F (63°C) per FDA food safety guidance. The parchment packet is very forgiving -- the fish stays moist even if slightly over 145°F because the steam prevents it from drying out the way it would in an open pan. If the packet has not puffed during baking, the seal has likely failed -- check the edges and add more time.

Can I substitute dried herbs for fresh?

Yes. General dried-to-fresh conversion: 1/2 teaspoon dried = 2 sprigs fresh (as listed in this recipe). For thyme, dried is a very good substitute and holds up well in the enclosed steam environment. Note that the en papillote method concentrates herb flavors more than open-pan cooking because the volatile aromatics cannot escape. Use assertive dried herbs like rosemary sparingly (1/4 tsp maximum); milder herbs like thyme, dill, or parsley at the standard conversion are fine.

What should I serve with Pacific cod en papillote?

The cooking juices that accumulate in the packet are well-seasoned with lemon and herb flavor -- a grain like rice or quinoa to soak them up is the most complementary side. Other good pairings: steamed asparagus or green beans (the clean vegetal flavor contrasts with the rich packet juices); garlic mashed potatoes (a more substantial, comforting pairing). Wine: a crisp, unoaked white -- Chablis, Sauvignon Blanc, or Pinot Gris. The lemon in the recipe is already providing acidity, so a lower-acid wine like an oaked Chardonnay is less ideal.

Pacific Cod in Parchment Paper – Easy, Healthy & Flavorful Recipe

January 31, 2025

Pacific cod fillet baked in parchment paper with lemon slices, garlic, and fresh thyme

Pacific Cod in Parchment Paper (En Papillote)

Cooking en papillote (in parchment paper) is a French technique that uses the steam trapped inside the sealed packet to cook the fish gently and evenly. The result is a moist, tender fillet infused with whatever aromatics you seal inside — lemon, garlic, and thyme in this version. It is one of the most forgiving methods for cooking white fish: the sealed environment prevents the fish from drying out even if it goes slightly over time, and cleanup is minimal.

Serves 2. Total time: approximately 30 minutes.

Ingredients

2 Pacific cod fillets (6–8 oz each)
1 lemon, thinly sliced
½ red onion, thinly sliced
2 cloves garlic, minced
2 tablespoons olive oil
Salt and black pepper (added just before sealing — see note below)
4 sprigs fresh thyme (or ½ teaspoon dried thyme)
Parchment paper

Alternative fish: Lingcod, Pacific Whiting, Halibut Cheeks, or Chilean Sea Bass all work with this method.

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Instructions

Step 1 — Preheat oven: Preheat to 400°F (200°C).

Step 2 — Prepare parchment: Cut two large sheets of parchment paper (approximately 12×16 inches each) and fold each in half. Place one cod fillet on one half of each sheet, centered with space around the edges for crimping.

Step 3 — Add aromatics and season: Layer lemon slices, red onion, and minced garlic over each fillet. Drizzle with olive oil. Season with salt and pepper. Place 2 sprigs of fresh thyme on top. Season just before sealing — if assembling in advance (see note), hold the salt until baking time.

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Step 4 — Seal the packets: Fold the other half of the parchment over the fillet. Starting from one corner, fold and crimp the edges in overlapping pleats all the way around to create a tight seal. The seal must be secure — if steam escapes, the fish steams less effectively and the cooking time increases.

Step 5 — Bake: Place the sealed packets on a baking sheet. Bake for 15–20 minutes (18–20 minutes if fillets are cold from the refrigerator, 15–17 minutes if at room temperature). The packets will puff up as steam builds inside — this is normal and indicates a good seal.

Step 6 — Open and serve: Remove from the oven. Carefully cut or tear open the top of each packet — there will be a burst of hot steam; open away from your face. Check doneness: the fish should be opaque throughout and flake easily with a fork, or read 145°F (63°C) on an instant-read thermometer. Serve immediately from the parchment.

Notes

Make-ahead: The packets can be assembled a few hours in advance and refrigerated. If doing so, do not add salt until just before baking — salt draws moisture from the fish via osmosis over time, making the surface wet and the texture slightly waterier. Add the salt at the last moment before sealing and baking.

Herb substitutions: Fresh dill (classic with white fish and lemon), flat-leaf parsley, or tarragon all work well in place of thyme. Avoid very assertive herbs like rosemary — the enclosed steam environment concentrates herb flavors more than open-pan cooking.

Serving suggestions: Steamed asparagus, green beans, or zucchini. Fluffy rice or quinoa to absorb the packet juices. Garlic mashed potatoes. A crisp, unoaked white wine — Chablis, Sauvignon Blanc, or Pinot Gris.

More whitefish: Whitefish Collection.

Videos: Global Seafoods YouTube Channel.

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Pacific Cod in Parchment Paper – Easy, Healthy & Flavorful Recipe