James Martin Lobster Thermidor

James Martin’s lobster thermidor folds cooked lobster meat through a rich sauce of white wine, fish stock, double cream and Dijon with chanterelles, enriches it with egg yolks, then piles it back into the shells under a Parmesan and breadcrumb topping and grills it golden. Served with a pile of matchstick fries, it takes under 30 minutes and serves two.

The recipe comes from his BBC show Home Comforts at Christmas, where he cooked it for Mary Berry. He frames it as a treat for you and a loved one, and dresses up the classic with luxe touches: earthy chanterelle mushrooms, a glossy egg-enriched sauce and a gratinéed cheese crust. The matchstick fries alongside are the classic French bistro partner.

The make-or-break moment is the egg yolks. You whisk them into the hot sauce and cook it very gently, just until it thickens and turns glossy, because letting it boil scrambles the yolks and splits the sauce. Since the lobster is already cooked, it only needs warming through, or it turns rubbery.

James Martin Lobster Thermidor

Recipe by Pinch Perfect

0.0 from 0 votes

Course: DinnerCuisine: BritishDifficulty: Easy

Servings

2

servings

Prep time

20

minutes

Cooking time

20

minutes

Calories

750

kcal

Total time

40

minutes

James Martin’s special-occasion lobster thermidor from BBC’s Home Comforts at Christmas, cooked on the show for Mary Berry. Cooked lobster in a creamy wine and mustard sauce with chanterelles, grilled in the shell under Parmesan, with matchstick fries. A decadent dinner for two.

Ingredients

• 1.5kg/3lb 5oz whole cooked lobster, halved lengthways, meat removed, shells cleaned and reserved

• 50g/1¾oz butter

• 2 shallots, finely chopped

• 125ml/4fl oz white wine

• 500ml/18fl oz fish stock

• 250ml/9fl oz double cream

• 1 tsp Dijon mustard

• 100g/3½oz chanterelle mushrooms, cleaned

• 2 tbsp roughly chopped flatleaf parsley

• squeeze lemon juice

• 25g/1oz grated Parmesan

• 2 free-range egg yolks

• 25g/1oz fresh breadcrumbs

• 4 King Edward potatoes, peeled and cut into matchsticks

• vegetable oil, for deep frying

• sea salt and freshly ground black pepper

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Directions

• Prepare:Preheat the grill to its highest setting. Put the cleaned lobster shells on a large baking tray and set aside.
• Soften the shallots:Heat half the butter in a frying pan over medium heat until foaming, then fry the shallots for 3-4 minutes until softened.
• Reduce the sauce:Add the wine and boil until reduced by half, then add the fish stock and simmer until reduced slightly. Add the cream and mustard and simmer for 3-4 minutes, until slightly thickened.
• Cook the mushrooms:Meanwhile, heat the remaining butter in a separate pan and fry the chanterelles for 2-3 minutes until just softened. Transfer to a bowl and season well.
• Combine:When the sauce has reduced, stir in the mushrooms and lobster meat, then add the parsley, lemon juice and half the Parmesan, and season again.
• Enrich:Whisk in the egg yolks and cook over low heat for 1-2 minutes, until just thickened, without boiling.
• Fill and top:Divide the lobster and sauce between the shells, then scatter over the breadcrumbs and remaining Parmesan.
• Fry the potatoes:Heat the oil in a deep-fat fryer to 190°C, or until a breadcrumb sizzles and browns when dropped in. (Hot oil is dangerous; don’t leave it unattended.) Carefully lower in the matchstick potatoes and fry for 4-6 minutes, until tender and golden. Drain on kitchen paper.
• Grill and serve:Grill the lobster for 3-4 minutes, until the topping is crisp and golden. Serve the lobster halves with the matchstick fries alongside.

FAQs

What is lobster thermidor?

It’s a classic French dish of cooked lobster meat in a rich, creamy sauce flavoured with mustard and wine, spooned back into the lobster’s own shell, topped with cheese and grilled until golden. It dates to 1890s Paris and is named after Thermidor, a month in the French Revolutionary calendar that was also the title of a play running at the time.

Martin’s version follows that template while adding his own flourishes: chanterelle mushrooms for earthiness, egg yolks to enrich the sauce, and a Parmesan-and-breadcrumb crust for crunch. The gratinéed top and the presentation in the shell are what make it feel so celebratory, which is why it’s a special-occasion dish rather than an everyday one.

Do I need a whole cooked lobster?

The recipe is built around a 1.5kg whole cooked lobster, and using a whole one matters for two reasons: you get the meat, and you keep the cleaned shells to fill and grill, which is central to the dish’s look. Buying it ready-cooked from the fishmonger saves you cooking a live lobster at home.

You can use frozen or pre-picked lobster meat in a pinch, but without the shells you’ll need to grill the thermidor in individual gratin dishes instead, losing some of the drama. Whatever you use, remember the lobster is already cooked, so it only needs warming through in the sauce; overcooking it makes the delicate meat tough and rubbery.

How do I add the egg yolks without scrambling them?

Gently, and off the boil. Whisk the yolks into the sauce and keep the heat low, cooking for just 1-2 minutes until the sauce thickens and turns glossy. The yolks enrich and lightly set the sauce, giving it body and sheen, but they curdle if the mixture boils, which would leave you with scrambled bits rather than a smooth sauce.

If you’re nervous, take the pan off the heat before whisking the yolks in, then return it to a low heat briefly. You can also temper them first by stirring a spoonful of the hot sauce into the yolks before adding them back. Either way, don’t walk away, since this stage moves quickly.

Can I swap the chanterelles?

Yes. Chanterelles are a luxurious, seasonal touch that suits the special-occasion feel, but they’re not essential. Chestnut mushrooms, button mushrooms or a mix of wild mushrooms all work well and bring their own earthiness to balance the rich sauce.

Whatever mushrooms you use, cook and season them separately as Martin does, rather than tipping them raw into the sauce. This drives off their water first, so they don’t dilute the carefully reduced sauce, and it lets you season them properly before they join everything else.

Do I have to deep-fry matchstick fries?

Matchstick fries, or pommes allumettes, are the classic French partner for lobster thermidor, and Martin deep-fries them at 190°C for that crisp, golden finish. He includes a firm safety caution, since hot oil is dangerous and shouldn’t be left unattended, so use a proper deep-fat fryer or a deep, heavy pan and never fill it more than a third full.

If you’d rather avoid deep-frying, cut the potatoes a little thicker and oven-bake them tossed in oil, or serve the lobster with a crisp green salad or some new potatoes instead. The fries are there for contrast and indulgence, so any crisp, simple side that cuts the richness will do the job.

Can I make it ahead, and is it worth it for a special occasion?

It’s best assembled and grilled fresh, so the topping is crisp and the lobster just-warmed. You can get ahead by making the sauce and prepping the lobster earlier in the day, then combining everything, filling the shells and grilling to order when you’re ready to eat, which keeps the last-minute work small.

As for whether it’s worth it: Martin pitches it precisely as a treat for two, and it is genuinely a restaurant-standard dish to make at home. For an anniversary, Valentine’s or a Christmas Eve dinner for two, it delivers real occasion, which is exactly the spirit in which he cooked it on the show.