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Mousse de Poisson — Cold Fish Mousse

Cold fish mousse is one of the poissonnier's most refined cold preparations — a velvet-smooth purée of raw or cooked fish, bound with velouté and gelatin, lightened with whipped cream, and set in a mould for unmoulding and presentation. It appears on cold buffets, as a first course, or as a component of more elaborate presentations (salmon mousse inside a paupiette, or lining a fish terrine). The classical method: purée 400g raw fish flesh (salmon for colour, sole for purity, pike for tradition) in a food processor until completely smooth. Push through a fine tamis twice — this removes every fibre and produces an almost liquid smoothness. Season firmly (the cold dulls flavour — season 20% more than tastes correct at room temperature). Prepare 200ml aspic or strong fish fumet with 8g leaf gelatin (bloom in cold water, dissolve in the warm fumet). Combine the fish purée with 150ml thick fish velouté and the gelatin-enriched fumet. Stir over ice until the mixture begins to thicken (approaching the setting point of 15-20°C). At this moment — not before, not after — fold in 200ml softly whipped cream (it should just hold its shape; over-whipped cream makes the mousse grainy). Pour into a lightly oiled mould (ring mould, dariole, or terrine), smooth the surface, and refrigerate for at least 4 hours or overnight. To unmould, briefly dip the base in warm water (5 seconds), invert onto the serving plate, and give a sharp downward shake. Decorate with cucumber slices, chervil, and a mirror of aspic. The mousse should slice cleanly, hold its shape on the plate, and melt on the tongue — the texture of a culinary cloud.

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ServesFour portions
Total4 hours 45 minutes (including chilling)
Sourced1of 10 in BC
Cook
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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.

400 g
raw fish flesh
salmon for colour, sole for purity, or pike for tradition — skin and pin-bones removed
Not yet stocked in British Columbia
150 ml
fish velouté
thick, well-reduced
Not yet stocked in British Columbia
200 ml
fish fumet or aspic
strong, warm
Not yet stocked in British Columbia
8 g
leaf gelatin
bloomed in cold water before use
Origin · FranceLekker · Vancouver →
200 ml
double cream
softly whipped to just-holding peaks
Your own market
1 tbsp
dry vermouth
Noilly Prat preferred
Not yet stocked in British Columbia
To decorate
as needed
cucumber
thinly sliced
Your own market
as needed
chervil
picked into small sprigs
Not yet stocked in British Columbia
as needed
aspic
cooled to near-setting point, for glazing
Not yet stocked in British Columbia
For the mould
as needed
neutral oil
for lightly oiling the mould
Not yet stocked in British Columbia

Each tap is counted, so the stockist sees the demand Provenance sends them.

II

The Method

1
Process the raw fish flesh in a food processor until completely smooth. Pass the purée through a fine tamis twice, pressing firmly with a plastic scraper until nothing remains above the mesh but dry fibre. The result should be almost liquid in consistency. Any fibre or visible lump remaining is unacceptable at this stage.
2
Season the purée firmly — approximately 20 per cent more than tastes correct at room temperature, as cold suppresses flavour perception. Transfer the purée to a bowl set over ice and stir in the thick fish velouté until fully combined.
From the canon — One of Escoffier's five mother sauces — a blonde roux married to a light, well-made stock (veal, chicken, or fish) to produce a sauce of ivory colour and vel… Velouté →
3
Bloom the leaf gelatin in cold water until fully softened, then dissolve it in the warm fumet or aspic. Stir the gelatin-enriched fumet into the fish and velouté base. Add the dry vermouth. Continue to stir the mixture over the ice bath until it begins to thicken and the temperature approaches 15–20 °C. This is where the dish lives or dies: too warm, and the gelatin cannot hold the incorporated air; too cold, and the gelatin has already begun to set and the cream will not integrate smoothly — the window is narrow and must be judged precisely.
4
At the moment the base reaches its setting point and coats the back of a spoon with a light, trembling body, fold in the softly whipped cream in two additions. The cream must hold its shape but not be stiff — over-whipped cream produces a granular, heavy texture. Fold with a wide spatula using long, slow strokes until no white streaks remain and the mousse is uniformly pale and aerated.
From the canon — Whipped cream begins with heavy cream at 35-40% butterfat, chilled to 4°C/39°F or below — the fat must be cold and solid for the network of air bubbles to hold. Whipped Cream — Soft Peaks to Stiff Peaks →
5
Pour the mousse into a lightly oiled mould — ring mould, dariole, or terrine. Smooth the surface with a palette knife. Cover and refrigerate for at least 4 hours, or overnight. The gelatin requires this time to set fully; a shorter chill will prevent clean slicing and risk collapse on unmoulding.
6
To unmould, dip the base of the mould in warm water for 5 seconds — no longer. Invert onto the serving plate and give a single sharp downward shake. The mousse should release cleanly and hold its shape without slumping. Decorate with cucumber slices and chervil. Spoon over a thin mirror of near-set aspic and return briefly to the refrigerator to set the glaze. The finished mousse slices cleanly, holds its form on the plate, and melts without resistance on the tongue.
III

Quality Hierarchy

01
Reserve — Wild salmon or line-caught Dover sole, filleted and skinned to order; house-made fish velouté from a fumét of fresh sole bones; Noilly Prat; and a clear aspic set from reduced fish stock and leaf gelatin.
02
Estate — Farmed salmon of known provenance or farmed sole; fish velouté made from a good commercial fish stock reduced by half; quality dry vermouth.
03
Market — Any firm-fleshed white fish or salmon available that day; velouté from a reliable fish stock concentrate; standard leaf gelatin.
04
House — Pre-filleted supermarket fish; velouté from a commercial liquid stock; powdered gelatin used at the stated equivalent; no vermouth.
IV

Sensory Tests

◇Touch. After the double tamis, the purée flows almost like a liquid and leaves no fibre or lump on the mesh.
◇Touch. The base, stirred over ice, coats the back of a spoon with a light, trembling body and registers 15–20 °C — the gelatin setting point.
◇Sight. The folded mousse is uniformly pale, fully aerated, and free of white cream streaks before it enters the mould.
◇Sight. On unmoulding, the mousse releases in one piece, holds its edges cleanly, and accepts the aspic glaze without sagging.
◇Where it lives or dies. The mousse lives or dies at the moment the cream is folded in: the base must be at 15–20 °C — warm enough to remain fluid, cold enough for the gelatin to hold the air — and the cream must be soft, not stiff.
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VI

What to Pour

A lean, unoaked or lightly oaked white Burgundy or a Muscadet Sèvre-et-Maine sur lie — the mousse's delicacy demands a wine of similar restraint, with enough acidity to cut the cream and enough minerality to complement the fish without overwhelming it.

The whole pairing
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Where the dish comes from and how it came to be — on every recipe.
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Sourced through Provenance

The hands behind the plate.

Lekker
Vancouver · leaf gelatin
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