P
French · Paris
Homard Thermidor (Lobster Thermidor)
A split, grilled live lobster, its flesh removed, dressed in a cream sauce enriched with shallot, white wine, Cognac, and Dijon mustard, returned to the half shell, masked with more sauce, scattered with Gruyère and gratinéed until golden. Homard thermidor is among the most celebrated of all classical luxury preparations — the combination of the sweet, firm lobster flesh and the mustard-enriched cream sauce gratinéed to a golden, slightly caramelised surface is, in the classical repertoire, the most complete expression of the lobster as an ingredient.
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I
The Market List
The benchmark for each ingredient, and who stocks it near you. Tap a stockist to go straight to the product.
2 × 700 g minimum
live lobsters
killed and split immediately before cooking
Not yet stocked in British Columbia
For the thermidor sauce
2
shallots
finely chopped
Your own market
30 g
unsalted butter
Your own market
100 ml
dry white wine
Not yet stocked in British Columbia
50 ml
Cognac
for flambéeing the deglaze
Not yet stocked in British Columbia
200 ml
double cream
reduced to coating consistency
Your own market
1 tbsp
Dijon mustard
added off heat only; per 200 ml sauce
Your own market
1 small bunch
1 squeeze
lemon juice
to finish, off heat
Not yet stocked in British Columbia
To gratinée
60 g
Gruyère
finely grated
Not yet stocked in British Columbia
Each tap is counted, so the stockist sees the demand Provenance sends them.
II
The Method
1
Kill and split each lobster immediately before cooking. Remove the claws from the body. Place the split halves flesh side up, shell side down, on a grilling tray. Grill the halves under a maximum-heat element for 6–8 minutes. At the correct endpoint, the flesh is opaque throughout but retains a slightly creamy, translucent appearance at the deepest point of the tail; the shell is deep orange-red. Press the flesh — it yields and springs back. This is 75% cooked. The flesh will pass through two further cooking stages; it must not be taken further here.
2
While the lobster halves grill, poach the claws in rapidly boiling water for 8 minutes. Drain, crack the shells, and extract all claw meat cleanly.
3
Carefully extract the tail flesh from the grilled half-shells. Cut into medallions. Reserve the cleaned shells.
4
Soften the shallots in butter over a medium heat without colouring. Deglaze with the white wine, then add the Cognac and flambé. Reduce until almost dry. Add the cream and reduce to a coating consistency. Remove the pan from the heat entirely before stirring in the Dijon mustard, fresh tarragon leaves, and a squeeze of lemon juice. A correctly made sauce will simultaneously carry the aromas of the sea, cream, tarragon, and the sharpness of mustard — all four notes perceptible at once.
5
Add the lobster medallions and claw meat to the sauce — just enough to coat and warm through. Spoon the mixture back into the cleaned half-shells. Mask the surface with additional sauce.
6
Scatter the finely grated Gruyère evenly over the filled shells. Place under a maximum-heat grill with the surface no more than 10 cm from the element for 4–5 minutes. The dish is ready when the surface is gold and bubbling, the Gruyère showing its own Maillard spotting, and the sauce at the edges still moist and cream-coloured beneath the crust.
III
Quality Hierarchy
01
Reserve — Live lobster of at least 700 g per person, killed to order; Cognac of named house quality; Gruyère de Comté AOP, finely hand-grated; fresh tarragon from a named grower.
02
Estate — Live lobster sourced that day from a known fishmonger; a sound Cognac VS; Gruyère AOP bought in a block and grated to order; market-fresh tarragon.
03
Market — Live lobster from a reliable wet-fish counter; dry vermouth substituted for Cognac where necessary; supermarket Gruyère, block form; fresh tarragon from a supermarket herb section.
04
House — Pre-killed whole lobster purchased the same day; brandy in place of Cognac; pre-grated Gruyère; dried tarragon used sparingly (reduce the quantity by half).
IV
Sensory Tests
◇Sight. After the initial grill: flesh opaque throughout, faintly creamy at the deepest point of the tail; shell a deep orange-red.
◇Touch. After the initial grill: flesh yields under finger pressure and springs back — indicating 75% cooked, not set firm.
◇Smell. Finished thermidor sauce: simultaneous presence of the sea (Cognac deglaze), cream, tarragon, and mustard sharpness — all four notes distinct.
◇Sight. At gratinée: surface gold and bubbling, Gruyère showing Maillard spotting, sauce still moist and cream-coloured at the shell edges.
◇Where it lives or dies. The dish lives or dies at the initial grill: lobster flesh taken to full doneness at this stage will be overcooked and rubbery by the time it has passed through the sauce and the gratinée — the target is 75% cooked, opaque but still faintly translucent at the deepest point.
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VI
What to Pour
The pairing
Whisky
From British Columbia
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The whole pairingPillar VII
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Sourced through Provenance