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Lobster Thermidor Recipe

Lobster Thermidor

iamwinfred
Lobster Thermidor is the ultimate showstopper for special occasions, combining succulent lobster meat with a rich, cognac-spiked cream sauce, topped with nutty Gruyere cheese and broiled until golden. This French classic has graced the finest tables since the late 1800s, and for good reason. Despite its fancy reputation, this recipe is surprisingly manageable for home cooks with detailed step-by-step instructions. Perfect for anniversaries, holidays, or any time you want to treat yourself to a restaurant-quality meal at home.
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Prep Time 25 minutes
Cook Time 35 minutes
Total Time 1 hour
Course Main Course
Cuisine French
Servings 4 servings
Calories 685 kcal

Equipment

  • Large stockpot at least 12 quarts
  • Sharp chef's knife
  • Kitchen shears
  • Large skillet or sauté pan
  • Whisk
  • Baking sheet
  • Cutting board
  • Measuring cups and spoons
  • Grater for cheese
  • Tongs

Ingredients
  

  • 4 whole lobsters 1.5 pounds each (680g each)
  • 6 tablespoons butter divided (85g)
  • 3 shallots minced
  • 8 oz mushrooms finely chopped (225g)
  • 1/4 cup cognac or brandy 60ml
  • 3 tablespoons all-purpose flour 24g
  • 1 1/2 cups heavy cream 360ml, at room temperature
  • 1/2 cup fish stock 120ml
  • 2 tablespoons Dijon mustard 30ml
  • 1/4 cup fresh parsley chopped (15g)
  • 1 tablespoon fresh tarragon chopped (3g)
  • 1 cup Gruyere cheese grated (100g)
  • 1/4 cup Parmesan cheese grated (25g)
  • Salt and white pepper to taste
  • Lemon wedges for serving

Instructions
 

  • Fill a large stockpot with water and add about 2 tablespoons of salt per quart. Bring to a rolling boil over high heat.
  • Plunge the live lobsters head-first into the boiling water, cover, and cook for 8-10 minutes until shells turn bright red. Remove with tongs and cool on a cutting board for 10 minutes.
  • Twist off the claws and tails from the bodies. Use kitchen shears to cut down the center of each tail shell on the underside and carefully remove the tail meat in one piece.
  • Crack the claws with the back of a knife or nutcracker and extract all the meat. Remove the dark vein from each tail. Chop the lobster meat into bite-sized pieces, keeping a few larger chunks for presentation. Reserve the empty tail shells.
  • Melt 4 tablespoons of butter in a large skillet over medium heat. Add the minced shallots and cook for 2-3 minutes until translucent and fragrant.
  • Stir in the chopped mushrooms and cook for 5 minutes until they release their moisture and start to brown. Pour in the cognac and let it simmer for 1 minute to cook off the alcohol.
  • Sprinkle the flour over the mushroom mixture and stir constantly for 2 minutes to create a roux. Gradually whisk in the heavy cream and fish stock, stirring constantly to prevent lumps.
  • Add the Dijon mustard, chopped parsley, and tarragon. Season with salt and white pepper to taste. Simmer for 5-7 minutes until the sauce thickens enough to coat the back of a spoon.
  • Reduce heat to low and gently fold the chopped lobster meat into the sauce. Stir carefully to coat all the lobster pieces without breaking them apart. Let the mixture warm through for 2-3 minutes.
  • Preheat your broiler to high and position the oven rack 6 inches from the heat source. Arrange the reserved lobster tail shells on your baking sheet and spoon the lobster and sauce mixture generously into each shell.
  • Mix together the grated Gruyere and Parmesan cheeses. Sprinkle evenly over the top of each filled shell and dot with the remaining 2 tablespoons of butter.
  • Place the baking sheet under the broiler for 3-5 minutes, watching carefully, until the cheese is golden brown and bubbling. The edges should be lightly caramelized but not burned.
  • Transfer the broiled lobster shells to serving plates using a wide spatula. Garnish with fresh parsley and lemon wedges. Serve right away while the cheese is still bubbling.

Notes

  • Don't overcook the lobster during boiling: the initial boiling should leave the meat slightly underdone since it will cook more under the broiler.
  • Use freshly grated cheese: pre-shredded cheese contains additives that prevent smooth melting.
  • Keep the cognac handy: a splash added at the end brightens up the sauce beautifully.
  • Watch the broiler closely: the difference between perfectly golden and burnt happens in seconds.
  • Let lobsters cool properly: trying to work with them too soon leads to torn meat and burnt fingers.
  • Save the shells: the presentation in the natural shells elevates the entire dish.
  • Room temperature cream: cold cream can cause the sauce to break or become grainy.
  • Fresh herbs matter: dried herbs simply can't match the brightness fresh tarragon brings.
  • Make-ahead: cook the lobsters and prepare the sauce up to 24 hours in advance, storing them separately in airtight containers in the refrigerator.
  • Substitutions: dry white wine or dry sherry can replace cognac; use large shrimp instead of lobster for a budget-friendly option.
  • Storage: store assembled but unbroiled Lobster Thermidor covered tightly with plastic wrap for up to 1 day. Freezing is not recommended as the cream sauce tends to separate.
  • Reheating: place refrigerated leftovers in a 350°F oven for 10-12 minutes until warmed through, then broil for 2-3 minutes to refresh the cheese topping.

Nutrition

Serving: 1ServingCalories: 685kcalCarbohydrates: 12gProtein: 46gFat: 48gSaturated Fat: 28gCholesterol: 285mgSodium: 950mgFiber: 1gSugar: 3gVitamin A: 35IUCalcium: 42mgIron: 8mg
Keyword creamy seafood dish, French seafood recipe, lobster recipe, lobster thermidor, special occasion dinner
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