Liver Pâté & Chicken Liver Mousse Set Temperature

Liver is rich in water-soluble proteins (including heat-sensitive albumins) and contains glycogen, myoglobin, and a high density of mitochondria-associated proteins. At 70°C, the bulk of these proteins reach their denaturation endpoint: they unfold and cross-link, setting the matrix. Simultaneously, intracellular fat droplets — which are responsible for mousse richness — remain emulsified within the set protein network rather than separating as free fat. Beyond 75°C, protein shrinkage expels both free water and emulsified fat, and further Maillard browning of the outer surface intensifies bitter compounds. The result above 75°C is a cooked-through, granular, bitter-tasting liver that cannot be rescued by additional blending.

• Cut surface of cooked livers should show uniform pale pinkish-brown throughout, with no red or purple translucency at the center
• Cooked livers feel just firm under finger pressure — not soft and slippery (underdone) or hard and dry (overdone)
• Blended mousse at this temperature takes on a very smooth, ribbon-like consistency when processed; it coats a spoon thickly
• No pooling of separated fat or watery exudate in the blending bowl — fat is emulsified
• Aroma is savory and rich, with a mild iron note — not sharp, sulphurous, or raw

• Insert a thin probe thermometer into the thickest liver lobe; check several pieces for consistency
• For terrine (bain-marie oven method): probe the center of the packed terrine through the foil cover at 70°C; remove from oven immediately
• For pan-seared approach (then blended): sear until just firm to touch and no longer pink at center (~3–4 min per side over medium heat), verify center temperature before blending
• For sous vide: hold at 65°C for 30 minutes achieves pasteurization and the correct texture for chicken liver mousse without reaching 70°C drying point
• Cool rapidly in an ice bath before blending to prevent carryover pushing past 75°C

Liver in a hot pan or terrine carries over quickly — remove from heat at 68–69°C and let residual heat complete the job. In a terrine, the water bath holds heat effectively; verify the center before cooling in ice.

• Protein denaturation temperature

  Liver's rapid protein set-and-shrink behavior is the defining factor in this narrow window

• Emulsification in liver mousse

  Fat must remain emulsified within the protein network — overcooking breaks the emulsion

• Bain-marie (terrine cookery)

  Gentle water bath heat prevents the outside of a terrine from overcooking while the center catches up

• Sous vide pasteurization

  Lower-temperature, longer-hold alternative that achieves food safety while preserving moisture

• Foie gras just-set center

  Related principle applied to fattened liver at 54°C; the fat-protein ratio difference shifts the target

1. 1.Charcuterie: The Craft of Salting, Smoking, and Curing — Michael Ruhlman & Brian Polcyn (W. W. Norton, 2005)
2. 2.The River Cottage Meat Book — Hugh Fearnley-Whittingstall (Hodder & Stoughton, 2004)
3. 3.On Food and Cooking: The Science and Lore of the Kitchen — Harold McGee (Scribner, 2004)
4. 4.Under Pressure: Cooking Sous Vide — Thomas Keller (Artisan, 2008)
5. 5.UK Food Standards Agency Guidance on Campylobacter in Liver Pâté (FSA 2012)

Confidence: high