Mousse de Foie de Volaille — Chicken Liver Mousse

Ingredients

• 500 g chicken livers, fresh, trimmed of all sinew, bile ducts, and discoloured portions
• 500 ml whole milk, cold, for soaking
• 30 ml clarified butter, for sautéing
• 60 ml cognac or Armagnac, for deglazing and flambéing
• 50 ml port, reduced
• 150 g unsalted butter, softened, 82% butterfat, European-style
• 8–10 g sheet gelatin, bloomed in cold water
• 30 ml warm stock, at 40°C, to dissolve bloomed gelatin
• 8–10 g fine sea salt, per kg of finished base
• 1 pinch white pepper, freshly ground
• 0.5 g quatre-épices
• 200 ml double cream, whipped to soft peaks
• Optional finish
• 50 g unsalted butter, softened, to mount at the end for extra richness and sheen
• as needed clarified butter, melted, to seal surface

Method

1. 1
   Place the trimmed livers in a bowl and cover with cold milk. Refrigerate at 2–4°C for 2–4 hours to draw out residual blood and temper any bitterness. Drain and pat thoroughly dry with absorbent paper. The livers should be pale and free of any pooled liquid before they enter the pan.
2. 2
   Heat a heavy-based pan until the clarified butter shimmers at a pan-surface temperature of 200–210°C. Sauté the livers for 60–90 seconds per side. The exterior must show clear caramelisation — a deep golden-brown crust — while the interior registers 63°C and remains rosy-pink throughout. This is where the dish lives or dies: livers taken beyond 68°C turn chalky and grainy, a defect no subsequent processing can correct.
3. 3
   Remove the livers and deglaze the pan with the cognac or Armagnac. Tilt the pan to flambé and burn off the raw alcohol completely; the flames subside to nothing and the sharp spirit smell gives way to a rounded, caramelised aroma. Add the reduced port and stir to lift all fond from the base of the pan.
4. 4
   Transfer the livers and all pan juices to a food processor with the 150 g of softened butter. Process for 3–4 minutes until the purée is completely smooth and no solid fragments remain. Pass the entire mass through a fine tamis, pressing firmly. The finished purée should flow through the mesh as a ribbon of uniform, lump-free silk — if any granularity is detectable on the back of a spoon, return it to the tamis.
5. 5
   Dissolve the bloomed sheet gelatin in 30 ml of warm stock held at 40°C. Incorporate this gelatin solution into the warm liver purée and stir until fully combined. Add the fine sea salt, white pepper, and quatre-épices. Taste: the seasoning should be distinct, as chilling will mute it perceptibly.
6. 6
   Set the bowl over an ice bath and stir gently until the base cools to 22–24°C. The mixture will thicken slightly and lose its sheen. At this temperature — and not before — fold in the cream whipped to soft peaks, working in broad strokes to preserve aeration. The finished base should be pale, voluminous, and hold a slow, reluctant ribbon when lifted on a spatula.
7. 7
   Transfer the mousse to a terrine or individual moulds lined with plastic film. Smooth the surface. Chill for a minimum of 6 hours at 2–4°C. The set mousse is ready when it holds a clean edge under a warm knife and the surface is firm but yields without resistance to the lightest finger pressure.