Langoustine gratin

Langoustine gratin
This elegant gratin has a layer of brunoise vegetables in the bottom, with langoustine tails (scampi) cooked in two stages on top, finished with a thick creamy sauce, made with the "fumet" from the langoustines.

This recipe is quite long to make, but can be prepared in stages over a number of days. The end result is well worth all the effort.
58K 40 4.3
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Last modified on: December 30th 2019

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For 6 people, you will need:

Change to the quantities for: 2 people 3 people 6 people 12 people 18 people
How long does it take?
Time required for this recipe:
PreparationCookingStart to finish
1 hour 32 min.43 min.2 hours 15 min.
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Step by step recipe

Stage 1 - 20 min.
Langoustine gratin

Boiling the langoustines

Boil the langoustiens for 30 seconds in boiling salted water, then cool under running cold water.

Shell them and set aside the tails. Keep half the heads for making the fumet.

Stage 2 - 5 min.
Langoustine gratin

The langoustine fumet

Prepare 1 Bouquet garni and finely chop 30 g onion.

Stage 3 - 2 min.
Langoustine gratin
Melt 30 g butter in a large saucepan on medium heat, then add the chopped onion, salt and pepper.

Cook for 1 minute without colouring.

Stage 4 - 1 min.
Langoustine gratin
Add the langoustine heads...

Stage 5 - 2 min.
Langoustine gratin
... and crush briefly with the end of a rolling pin, for example.

Stage 6 - 1 min.
Langoustine gratin
Pour in 200 ml water and 200 ml dry white wine, then add the bouquet garni.

Stage 7 - 5 min.
Langoustine gratin
Bring to the boil, then turn down the heat to its lowest setting and leave to reduce by half.

This simmering will create the "fumet", as the liquids (water and wine) mingle with the flavours of the bouquet garni and langoustine heads.

Stage 8 - 40 min.
Langoustine gratin

The vegetable brunoise

While the fumet is reducing, rinse and peel 2 carrots and 3 turnips, then dice very small ("fine brunoise").

Rinse the courgette and cut the part with the green skin into tiny dice (you can use the leftover courgette in another recipe).

I have to admit, this is a long, arduous task!

Stage 9 - 5 min.
Langoustine gratin
Bring a large saucepan of salted water to the boil.

Immerse a fine metal strainer, which will enable you to remove the vegetables quickly.

Stage 10 - 1 min.
Langoustine gratin
Toss the diced courgettes into the water, wait until the pan comes back to the boil, then remove them immediately by simply lifting out the strainer.

Stage 11 - 1 min.
Langoustine gratin
Cool the diced courgettes under running cold water to stop the cooking...

Stage 12 - 2 min.
Langoustine gratin
...drain thoroughly, then tip out onto absorbant paper to wait.

Stage 13 - 5 min.
Langoustine gratin
Do the same with the carrots and turnips, which can be cooked together, and for 30 seconds longer than the courgettes.

Note: Don't throw this cooking water away - it is now worth keeping.

Stage 14 - 4 min.
Langoustine gratin

Second-stage cooking of langoustines

Melt 30 g butter in a frying pan on high heat. When good and hot, add the langoustine tails.

Fry for a minute or two until they start to brown, then set aside.

Stage 15 - 3 min.
Langoustine gratin

The gratin cream sauce

Let's go back to the fumet, which by now should be reduced by half. Strain into a bowl and discard everything but the liquid.

Stage 16 - 2 min.
Langoustine gratin
Pour this back into the pan (after rinsing out), but be careful to keep back the dregs of the fumet which will be full of sand and should be discarded.

Stage 17 - 8 min.
Langoustine gratin
Put the fumet back on medium heat and leave to reduce by half again.

Stage 18 - 3 min.
Langoustine gratin
Add 250 ml liquid cream, salt lightly, pepper and then check the seasoning.

Stage 19 - 2 min.
Langoustine gratin
Bring to the boil, take off the heat and and 20 g cornflour (mixed with a little cold water) all at once while beating with a whisk.

The mixture should thicken rapidly. This will give us enough sauce to cover the gratin. Set aside.

Stage 20 - 4 min.
Langoustine gratin

Assembling the gratin

Preheat the oven to 390°F (200°C).

Butter a gratin dish and spread the mixed diced vegetables in an even layer.

Stage 21 - 2 min.
Langoustine gratin
Arrange the sautéed langoustine tails on top.

Stage 22 - 2 min.
Langoustine gratin
Pour the sauce over.

Stage 23 - 15 min.
Langoustine gratin

Cooking and serving

Bake for about 15 minutes, until the top is nicely browned (finish under the grill if necessary).

Stage 24
Langoustine gratin
Best served plated up (on hot plates): try to keep the langoustines on top and the vegetables underneath.
As I was saying, this recipe takes a long time, but much of it can be prepared in advance. Only the assembly of the gratin and final cooking need to be done just before serving.

You will see that in stage 19 the cream is not reduced, but thickened with cornflour instead. This is to keep a decent quantity of sauce without it being too liquid, otherwise it would run into the bottom of the dish.

If you are happy with the idea, you can dispense with boiling the langoustines in salated water in stage 1 and shell them raw before the sauté stage (stage 14).

To simplify the recipe, just slice the vegetables thinly instead of cutting into brunoise dice.
Should be eaten immediately.
Home made.
Nutritional information
Whole recipe
Energetic valueProteins CarbohydratesFats
2,882 Kcal or 12,066 Kj272 gr81 gr164 gr
144 %104 %8 %25 %
Per 100 g
Energetic valueProteins CarbohydratesFats
91 Kcal or 381 Kj9 gr3 gr5 gr
5 %3 %<1 %1 %
Per person
Energetic valueProteins CarbohydratesFats
480 Kcal or 2,010 Kj45 gr14 gr27 gr
24 %17 %1 %4 %
% are calculated relative to a Recommended Dietary Intake or RDI of 2000 k-calories or 8400 k-joules by day for a woman (change to a man).
Possible allergens in this recipe: Crustaceans, Celery, Milk, Sulfites
How much will it cost?
  • For 6 people : 27.60 €
  • Per person : 4.60 €

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Note: Be careful, these prices are only an estimate, you can consult the table of prices by ingredients used for this estimate.
This recipe uses (among others)
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