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How to Make Lobster Thermidor Gruyère Bake Without the Stress

This luxurious Lobster Thermidor Gruyère Bake transforms a French fine-dining classic into an approachable, elegant dish any home cook can master. Tender lobster, a cognac-infused cream sauce, and melted Gruyère create an unforgettable feast.
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Prep Time 30 minutes
Cook Time 15 minutes
Total Time 45 minutes
Servings: 2 servings
Course: Seafood
Cuisine: French
Calories: 685
Ingredients Method Notes

Ingredients
  

  • 2 lobster tails or whole lobsters 1½–2 lbs each
  • 3 tablespoons unsalted butter
  • 1/2 cup heavy cream
  • 1/2 cup grated Gruyère cheese
  • 1 shallot finely chopped
  • 1 tablespoon chopped fresh parsley
  • 1/2 cup dry white wine
  • 2 teaspoons brandy or cognac
  • 1 tablespoon Dijon mustard
  • Salt to taste
  • Freshly ground black pepper to taste
  • Paprika for garnish
  • 2 egg yolks

Method
 

  1. Bring a large pot of salted water to a boil. Add lobsters and cook 6–8 minutes for tails or 12–15 minutes for whole lobsters. Transfer to ice bath to cool.
  2. Melt butter in a skillet over medium heat. Add chopped shallot and sauté 2–3 minutes until translucent.
  3. Pour in white wine, scraping the pan to deglaze. Reduce by half.
  4. Stir in heavy cream and Dijon mustard. Simmer 4–5 minutes to thicken slightly. Remove from heat, then whisk in brandy and egg yolks until smooth.
  5. Dice lobster meat and fold gently into the sauce. Spoon mixture into lobster shells and top generously with Gruyère cheese.
  6. Bake at 200°C (400°F) for 10–15 minutes until golden and bubbling. Garnish with fresh parsley and paprika before serving.

Notes

Always remove the sauce from heat before adding egg yolks to prevent curdling. Slightly undercook the lobster—residual heat finishes the job. Allow some headspace in shells to avoid overflow during baking.