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Halibut en Papillote with Shaved Fennel, Snap Peas & Avocado-Tarragon Butter

Halibut en Papillote with Shaved Fennel, Snap Peas & Avocado-Tarragon Butter

Cooking fish en papillote is the oldest bistro trick in the book for a reason—it is foolproof, elegant, and traps every single drop of flavor. Here, we steam tender halibut with shaved fennel and a generous splash of natural white wine, then hit it with a very Californian twist: a melting avocado and tarragon compound butter. When you tear open the paper at the table, the fragrant steam rushes out, and that bright green butter melts into the white wine juices to create an instant, luxurious sauce.

Marguerite Lavigne
Marguerite Lavigne
Prep: 18 minutes
Cook: 14 minutes
2
easy
dinner
seafooden-papillotecalifornia-frenchbistro-classic+1

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Timeline

30 minutes
0m10m20m30m
Make avocado butter
5m
Prep vegetables
5m
Assemble papillotes
4m
Seal the packets
4m
Bake papillotes
14m
Serve and garnish

Ingredients

  • 2 fillets Halibut fillets(About 6 oz each, thick cut)
  • 1 whole Fennel bulb(Fronds reserved for garnish)
  • 1 whole Shallot(Peeled)
  • 1 cup Sugar snap peas(Strings removed)
  • 2 tbsp Dry natural white wine(A crisp Chenin Blanc or Sauvignon Blanc)
  • 1 tbsp Olive oil(Good quality extra virgin)
  • 1/2 tsp Kosher salt(For seasoning the fish)
  • 1/4 tsp Black pepper(Freshly ground)
  • 1/2 whole Ripe avocado(Pitted and peeled)
  • 2 tbsp Unsalted butter(Room temperature softened)
  • 1 tbsp Fresh tarragon(Finely chopped)
  • 1 whole Lemon(Yielding 1 tsp zest and 1 tbsp juice)
  • 1/4 tsp Flaky sea salt(For the butter)
  • 1 tsp lemon zest(from the lemon)
  • 1 tbsp lemon juice(from the lemon)

Instructions

  1. 1

    Preheat your oven to 400 degrees Fahrenheit (200 degrees Celsius). While the oven heats, make the avocado-tarragon butter. In a small bowl, use a fork to mash 1/2 ripe avocado with 2 tbsp unsalted butter, 1 tbsp fresh tarragon, 1 tsp lemon zest, 1 tbsp lemon juice, and 1/4 tsp flaky sea salt until smooth and creamy. Set aside.

    5 min

    Tip: Listen, replacing a classic heavy beurre blanc with an avocado compound butter is the most California thing I do, and I will never apologize for it. It brings richness without the weight.

  2. 2

    Prep your vegetables. Using a mandoline or a very sharp knife, shave 1 fennel bulb and 1 shallot as thinly as possible. Slice 1 cup sugar snap peas on the bias. In a medium bowl, toss the shaved fennel and shallot with 1 tbsp olive oil.

    5 min

    Tip: If your fennel has fronds attached, save a few delicate wisps to garnish the final dish.

  3. 3

    Assemble the papillotes. Tear off two large pieces of parchment paper (about 15 inches long) and fold them in half like a book. Open them up and divide the dressed fennel and shallot mixture evenly between the two papers, placing it near the crease. Lay the 2 Halibut fillets directly on top of the vegetable beds. Season the fish generously with 1/2 tsp Kosher salt and 1/4 tsp black pepper.

    4 min

    Tip: Parchment is traditional, but if you only have aluminum foil, that works too. It just lacks the romantic presentation of tearing open paper at the table.

  4. 4

    Scatter the snap peas over and around the fish. Spoon 2 tbsp dry natural white wine evenly over the fillets. To seal, fold the top half of the parchment over the fish. Starting at one end of the crease, make small, tight, overlapping folds all the way around the open edge to create a sealed half-moon packet. Place the packets on a rimmed baking sheet.

    4 min

    Tip: Don't be shy about crimping those edges tightly! The magic relies on trapping the steam.

  5. 5

    Bake in the preheated oven for 12 to 14 minutes, depending on the thickness of your fish. The parchment packets should puff up beautifully, turning golden around the edges.

    14 min

    Tip: If your fillets are exceptionally thick (over 1.5 inches), give them an extra two minutes.

  6. 6

    Transfer the puffed packets directly to wide, shallow dinner plates. Serve immediately, letting your guests snip open the paper tableside to release that gorgeous fragrant steam. Immediately drop a generous spoonful of the prepared avocado-tarragon butter directly onto the hot fish so it melts down into the wine juices.

    2 min

    Tip: Have some crusty baguette on standby. You will absolutely want to mop up the pan juices.

Chef's Notes

I always pour myself a glass of whatever wine I used in the papillotes while I cook. A lively, slightly oxidative Chenin Blanc pairs spectacularly well with the anise notes of the fennel and tarragon.

Frequently Asked Questions

How long does Halibut en Papillote with Shaved Fennel, Snap Peas & Avocado-Tarragon Butter take to make?

Halibut en Papillote with Shaved Fennel, Snap Peas & Avocado-Tarragon Butter takes about 32 minutes total. That includes 18 minutes of prep and 14 minutes of cooking.

How many servings does this recipe make?

This recipe makes 2 servings.

What skill level is needed for Halibut en Papillote with Shaved Fennel, Snap Peas & Avocado-Tarragon Butter?

This recipe is rated easy — it's beginner-friendly and straightforward.

What ingredients do I need for Halibut en Papillote with Shaved Fennel, Snap Peas & Avocado-Tarragon Butter?

The main ingredients are: Halibut fillets, Fennel bulb, Shallot, Sugar snap peas, Dry natural white wine, Olive oil, Kosher salt, Black pepper, Ripe avocado, Unsalted butter, Fresh tarragon, Lemon, Flaky sea salt, lemon zest, lemon juice.

What type of meal is Halibut en Papillote with Shaved Fennel, Snap Peas & Avocado-Tarragon Butter?

Halibut en Papillote with Shaved Fennel, Snap Peas & Avocado-Tarragon Butter is categorized as: dinner.