Lobster Thermidor
Homard Thermidor is lobster meat folded into a creamy mustard and cognac sauce, spooned back into its shell and baked under Gruyere until golden. One serving is about 213 g. This lobster thermidor recipe is a celebration dish from Paris, rich and dramatic, and it comes together in under an hour once the lobsters are cooked.
Homard Thermidor takes its name from Thermidor, the play by Victorien Sardou that opened in Paris in January 1891 and caused a scandal. Paris restaurants of the 1890s, notably Maison Maire near the theatres, served a lobster dish to mark the occasion, and the name stuck. The mustard in the sauce is the detail that separates Thermidor from its cousin, lobster Newburg, and it has been part of the recipe since the early published versions.
Pairs well with: Buttered new potatoes and a crisp green salad, with a glass of dry white wine.
Provenance
France
Paris Restaurant Classic
Nordic & European
Time Dedication
55m
30m prep • 25m cook
Batch Yield
4 Servings
470 kcal per serving
1 serving ≈ 213 g
Technical Skill
Advanced
Advanced (Shell Work)
Meal Timing & Digestive Fit
Breakfast
Not Advised
Lunch
Hearty Midday Main
Dinner
Ideal Hearty Main
Snack & Tea
Inappropriate
Paris Restaurant Classic
Photo: thefoodplace.co.uk, CC BY 2.0, via Wikimedia Commons
The Heritage Formulary
Estimated cost: High — about $14–18 per serving at home, depending on lobster prices (USD)
A Paris restaurant classic: lobster, mustard-spiked cream sauce, cognac and a gratinated Gruyere top.
Execution Methodology & Culinary Technique
Prep Stage: Boil the Lobsters and Set Out the Sauce
30 Mins • Pot and Knife Work
Boil the lobsters, cool them, split them in half and take out the meat, keeping the four shell halves clean for serving. Chop the shallot, grate the Gruyere, separate the egg yolk and measure the wine, milk, cream and cognac so the sauce comes together without a pause.
Maestro Tip: Keep the shells: a clean half-shell is the serving dish, and it is what makes Thermidor look like Thermidor.
12 Mins Boiling water, 100°C (212°F)
Bring a large pot of salted water to a rolling boil and cook the lobsters for 8 minutes. Lift them out, cool for 5 minutes, then split each one in half lengthways with a heavy knife and remove the meat, cutting it into bite-sized pieces. Rinse the shell halves and set them on a baking tray. Discard the dark stomach sac and the gritty intestinal vein.
Work while the lobsters are still warm; the meat comes out of the shell far more easily than when cold.
Done when: The shells are bright red and the meat is opaque and firm.
8 Mins Medium heat, about 175°C (350°F)
Melt 40 g of the butter in a pan, soften the shallot for 2 minutes, then pour in the wine and let it bubble until almost gone. Stir in the flour and cook for 1 minute, then pour in the milk a little at a time, stirring until smooth, and simmer for 3 minutes until the sauce coats a spoon.
Add the milk slowly and keep stirring; a lump-free sauce is the whole point of the dish.
Done when: A smooth sauce that coats the back of a spoon and leaves a clear line when you run a finger through it.
5 Mins Low heat, about 80°C (175°F)
Take the pan off the heat and stir in the cream, the cognac, the Dijon mustard and half the Gruyere until the cheese melts. Whisk in the egg yolk, then the lemon juice, and season with salt and white pepper. Do not let the sauce boil from here on, or the yolk will scramble.
Off the heat is the rule for the yolk; the residual warmth of the sauce is enough to cook it gently.
Done when: A glossy, pale-gold sauce that tastes rich, sharp and faintly of mustard.
5 Mins No heat
Fold the lobster meat into the sauce, then spoon the mixture back into the four shell halves, mounding it slightly. Scatter the remaining Gruyere over the top and dot with the last of the butter.
Mound the filling a little proud of the shell; it settles and browns better that way.
Done when: Four shells filled evenly, with cheese scattered over each.
8 Mins Grill, about 220°C (425°F)
Slide the tray under a hot grill for 6 to 8 minutes until the tops are golden brown and bubbling. Serve at once, while the shells are still hot and the sauce is molten.
Watch the grill like a hawk; the line between golden and burnt is about thirty seconds.
Done when: The tops are deep gold and bubbling, and the filling is steaming hot throughout.
Finishing Touches & Plating
Serve each half-shell on a warm plate with buttered new potatoes and a little green salad, and bring the tray to the table while the tops are still bubbling.
Nutritional Physiology & Benefits
Energy
470
kcal / serving
Protein
30g
Complete AA
Carbs
10g
Complex
Fats
32g
Healthy
| Energy | 470 kcal |
| Protein | 30 g |
| Carbohydrates | 10 g |
| Fat | 32 g |
| Fibre | 0.5 g |
| Sugar | 4.3 g |
| Sodium | 877 mg |
| Energy | 221 kcal |
| Protein | 14.2 g |
| Carbohydrates | 4.8 g |
| Fat | 14.8 g |
| Fibre | 0.2 g |
| Sugar | 2 g |
| Sodium | 413 mg |
Nutrition values are estimated — calculated from USDA FoodData Central values for the listed ingredients.
Vitamins & minerals: A strong source of protein, selenium, zinc, copper and vitamin B12 from the lobster, with calcium from the milk, cream and Gruyere. Nutrition is estimated.
Lean Protein, Rich Flavour
Lobster gives about 30 g of protein per serving with very little fat of its own; the richness comes from the sauce, not the shellfish.
Selenium and B12
Lobster is a strong natural source of selenium and vitamin B12, nutrients that support normal immune and nerve function.
A Small, Satisfying Portion
One half-shell is a complete, elegant portion, so the dish satisfies without the need for a second helping.
Food Pairings
To optimize nutrient absorption and elevate the sensory depth, pair with these authentic accompaniments:
Sides
Buttered New Potatoes
Soft, buttery potatoes soak up any sauce that escapes the shell and turn the dish into a full dinner.
Crusty Baguette
Warm baguette is the classic tool for chasing the last of the sauce around the plate.
Vegetables
Crisp Green Salad
A lemon-dressed salad cuts through the creamy sauce and refreshes the palate between bites.
Drinks
Dry White Wine
A dry white Burgundy or Muscadet matches the lobster and the creamy sauce without fighting the mustard.
Complete menu
Homard Thermidor with buttered new potatoes and a green salad, a glass of dry white Burgundy, and fresh berries to finish.
Digestive Guardrails
To prevent digestive distress, sluggishness, or palate clash, avoid pairing the dish with these elements:
Boiling the Sauce After the Yolk
Once the egg yolk is in, boiling scrambles it and turns the sauce grainy; keep the heat low and take the pan off the heat first. This is general guidance, not medical advice.
Shellfish Allergy
Lobster is a crustacean and a common allergen; anyone with a shellfish allergy should not eat this dish, and the cooking water and utensils should not be shared with their food. This is general guidance, not medical advice.
General information only, not medical advice — consult a doctor for personal dietary decisions.
Who Should Eat It
Health Conditions — Adjust or Avoid
If you have a medical condition, consult your doctor before changing your diet.
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