Mousse de jambon is a cold emulsified preparation built on a base of finely puréed cooked ham (Sus scrofa domesticus), bound with velouté or béchamel, stabilized with gelatin, and lightened with whipped cream (crème fouettée). The foundational ratio follows approximately 500 g puréed ham to 250 ml reduced velouté, 10–12 g bloomed sheet gelatin (180 bloom), and 300 ml heavy cream (35% butterfat minimum) whipped to soft peaks. The ham — ideally a jambon blanc or York-style ham with a lean-to-fat ratio of approximately 85:15 — is passed twice through a fine die on a meat grinder, then processed in a food processor with the warm velouté until the mixture achieves a completely smooth purée with no discernible fibers. The dissolved gelatin is incorporated at 35–38°C while the base is still slightly warm. The mixture is then cooled over an ice bath to approximately 18–20°C — cool enough to accept the cream without deflating it, yet warm enough to prevent premature gelatin setting. The whipped cream is folded in three additions using a large balloon whisk or spatula, preserving maximum aeration. The mousse is piped or spooned into lined dariole moulds, ramekins, or a terrine form and refrigerated at 2–4°C for a minimum of 4 hours to achieve a full set. Unmoulded mousse should hold its shape firmly while yielding a smooth, airy texture on the palate that dissolves without graininess. It is traditionally served on a mirror of aspic with cornichons, Dijon mustard, and brioche toasts.
{"Ham must be processed to a completely smooth purée with no residual fiber","Gelatin is added at 35–38°C to warm base before cooling over ice","Cream must be whipped to soft peaks only — stiff peaks create a grainy mousse","Fold cream at 18–20°C to prevent both deflation and premature gelatin set","Minimum 4 hours chilling at 2–4°C for full gelatin hydration and firm set"}
{"Pass the purée through a fine-mesh tamis after processing for an exceptionally silky texture","Add 1–2 tablespoons of port or Madeira to the warm base for aromatic complexity","Line moulds with plastic film for clean unmoulding, leaving a 5 cm overhang on all sides","Test gelatin set on a small sample before committing the full batch of whipped cream"}
{"Folding cream into a base that is too warm, causing it to deflate and lose volume","Using ham with excessive fat content, producing a greasy mouthfeel","Incorporating gelatin that has begun to set, creating visible strands or lumps in the mousse","Over-whipping the cream to stiff peaks, resulting in a dense, grainy texture","Insufficient seasoning of the base, yielding a bland mousse that lacks savory depth"}
Escoffier, Le Guide Culinaire (1903); Larousse Gastronomique; Pauli, Classical Cooking the Modern Way