Main Course · Dinner · French ·

Luxurious French Lobster Thermidor with Gruyère Crust

Name: Luxurious French Lobster Thermidor with Gruyère Crust
Prep time: 30 min
Cook time: 90 min
Total time: 120 min
Yield: 4 servings
Cuisine: Main Course
Ingredients: 4 live lobsters, 1 to 1.5 lbs each; 1 onion, quartered; 1 bay leaf; Salt, to taste; 2 tbsp unsalted butter; 2 shallots, finely chopped; 1/2 cup dry white wine; 2 cups heavy cream; 1 tbsp Dijon mustard; Pinch of cayenne pepper; Salt and freshly ground black pepper, to taste; 1 cup grated Gruyère cheese; 1/2 cup breadcrumbs; 1 tbsp finely chopped fresh parsley; 2 tbsp brandy; 2 tbsp unsalted butter, melted

Indulge in the extravagant flavors of France with this rich and creamy Lobster Thermidor, topped with a delightful Gruyère crust.

4.5(804 reviews)

·By Ethan Brooks·September 17, 2025

Luxurious French Lobster Thermidor with Gruyère Crust — Main Course served and photographed from above

Prep

30 min

Cook

1 h 30 min

Difficulty

Advanced

Serves

Ingredients

Servings

For the Lobster

For the Sauce

For the Gruyère Crust

For the Assembly

Nutrition

Per serving

Calories: 919 kcal
Protein: 51 g
Carbs: 17 g
Fat: 64.75 g
Fiber: 1 g

Whole recipe

Total

Calories: 3675 kcal
Protein: 204 g
Carbs: 68 g
Fat: 259 g
Fiber: 4 g

Breakdown by ingredient▾

Ingredient	Cal	P	C	F	Fib
4 live lobsters 1 to 1.5 lbs each	800	160	0	10	0
1 onion quartered	40	1	9	0	1.5
1 bay leaf	0	0	0	0	0
Salt to taste	0	0	0	0	0
2 tbsp unsalted butter	200	0	0	22	0
2 shallots finely chopped	20	0	5	0	0.5
1/2 cup dry white wine	100	0	3	0	0
2 cups heavy cream	1600	8	12	170	0
1 tbsp Dijon mustard	15	0	1	1	0
Pinch of cayenne pepper	0	0	0	0	0
Salt and freshly ground black pepper to taste	0	0	0	0	0
1 cup grated Gruyère cheese	400	28	1	32	0
1/2 cup breadcrumbs	200	7	36	2	2
1 tbsp finely chopped fresh parsley	0	0	1	0	0
2 tbsp brandy	100	0	0	0	0
2 tbsp unsalted butter melted	200	0	0	22	0

These are estimates, not dietary advice.

Preparation

Get these tasks done before you start cooking.

Preparing the Lobster

1
Boil Lobsters
Bring a large pot of salted water to a boil. Add onion and bay leaf.
2
Cook Lobsters
Submerge lobsters into the boiling water headfirst. Cook for about 8-10 minutes until bright red.
Tip: Do not overcook the lobsters; this can make them tough.
3
Ice Bath
Remove lobsters and plunge them into ice water to stop the cooking process.

Preparing the Sauce

1
Sauté Shallots
In a pan, melt butter and sauté shallots until translucent.
2
Reduce Wine
Add white wine and simmer until reduced by half.
3
Finish Sauce
Stir in cream, Dijon mustard, cayenne pepper, salt, and pepper. Simmer until the sauce thickens.
Tip: Freshly grated cheese melts more evenly and results in a creamier crust.

How to Make Luxurious French Lobster Thermidor with Gruyère Crust

Total time: 2 h · Yields 4 servings

1
Preparing Lobster Meat
Carefully remove meat from claws and tails, chop, and set aside.
2
Combining with Sauce
Stir cooked lobster meat into the thickened sauce, toss in brandy, and mix well.
3
Baking
Preheat oven to 375°F (190°C). Distribute lobster mixture evenly back into the shell. Top with Gruyère crust and drizzle with melted butter.