Foisonner

Foisonner (from the French foisonnement, meaning abundance or proliferation) is the broad pastry term for any mechanical process that introduces air into a fat-containing or egg-containing medium to expand its volume and alter its texture. The word encompasses whipping cream to soft or stiff peaks, beating ganache to a lighter consistency for truffles or icing, aerating a beurre blanc or sabayon, and churning ice cream or sorbet as it freezes. In each case the mechanism is the same: repeated agitation—by hand whisk, stand-mixer whisk attachment, or immersion blender—breaks the surface tension and traps air bubbles within a matrix of fat globules, proteins, or both. The result is always an increase in volume (foisonnement of cream roughly doubles its volume) and a change in mouthfeel from dense and liquid to light and mousse-like. Foisonner is distinct from the specific benchmark terms ruban (the ribbon stage of egg-and-sugar) or monter (to mount a sauce with butter) in that it describes the general principle of aeration rather than a single named stage. Crucially, the term also applies to ganache: when warm ganache is allowed to cool to approximately 27–28 °C and then beaten with a whisk or stand mixer, it foisonne—taking on a lighter colour, increased volume, and a spreadable, airy texture suitable for truffles or filling entremets. This ganache foisonnée technique is a cornerstone of modern chocolate work.

“After the ganache cooled to 27 °C, she foisonné it with the paddle attachment for four minutes until it lightened to a pale café-au-lait and increased to nearly double its original volume.”

• glossaryRuban (Ribbon Stage)
• TechniqueGanache
• TechniqueChantilly Cream

1. 1.Encyclopédie du Chocolat — Frédéric Bau (Valrhona)
2. 2.Pâtisserie: The Complete Guide — Christophe Felder
3. 3.The Professional Pastry Chef, 4th ed. — Bo Friberg
4. 4.On Food and Cooking — Harold McGee

Confidence: high