Sauce & Stock Techniques
Stock / Fond Brun & Fond Blanc
Also: Fond brun, Fond blanc, Brown stock, White stock, Bone broth, Jus lié, Demi-glace base
The gelatin-rich bone-and-collagen extractions that form the foundational liquids of classical cooking, divided into dark (roasted) and pale (unroasted) families.
/fawn brawn / fawn blahn (French); stock (English)/French (fond, 'base, foundation'; brun, 'brown'; blanc, 'white'); the systematic classification appears in La Varenne's 'Le Cuisinier François' (1651) and is codified definitively in Escoffier's 'Le Guide Culinaire' (1903).
Definition
Stock — or in classical French terminology, fond — is the liquid produced by long simmering of bones, cartilage, aromatic vegetables, and herbs in water. Its defining quality is gelatin: collagen in bones and connective tissue converts to gelatin during the simmer, giving properly made stock a body and viscosity that water and most commercial substitutes lack. The division into fond brun (brown stock) and fond blanc (white stock) is fundamental to classical sauce architecture. Fond brun is made from bones that have been roasted in a hot oven until deeply browned — typically beef, veal, lamb, or game — before being added to the pot along with similarly roasted aromatic vegetables (onion, carrot, celery) and a tomato element. The Maillard reaction products from roasting give brown stock its rich, complex, savory character and dark color; it is the base for demi-glace, espagnole, bordelaise, and most braising liquids. Fond blanc is made from unroasted bones — typically veal, chicken, or fish — blanched (for veal and beef white stock) to remove impurities, then gently simmered without coloring. It remains pale and delicate, the base for velouté and cream sauces. Fish stock (fumet de poisson) is a specialized white stock using fish bones and heads; the simmer is short (20–30 minutes) because overextraction from fish makes the stock bitter and gelatinous in an unpleasant way. All stocks benefit from cold-water starts, the periodic skimming of albuminous scum in the first thirty minutes, and a slow simmer below boiling — boiling clouds the stock and emulsifies fat that cannot be fully recaptured. Properly chilled stock gels to a solid, the definitive sign of adequate gelatin content.
In use
“For the braised short ribs she started a fond brun the night before, roasting split marrow bones at 230°C until mahogany before adding them to the stockpot — the finished stock set firm as jelly in the refrigerator overnight.”
See also
- glossaryFond / Fond de Cuisine
- glossaryDeglaze / Déglacer
- techniquesReduction
Related terms
References
- 1.Escoffier — Le Guide Culinaire (1903, trans. H.L. Cracknell & R.J. Kaufmann, 2011)
- 2.Joel Robuchon — Larousse Gastronomique (2009 edition)
- 3.Harold McGee — On Food and Cooking (revised 2004)
- 4.Thomas Keller — The French Laundry Cookbook (1999)
- 5.Heston Blumenthal — Heston Blumenthal at Home (2011)
Confidence: high
Notes
Gelatin and body
The gelatin content of a stock determines how much it coats the palate and how sauces derived from it cling to food. Veal bones are particularly high in collagen; a veal stock made with plenty of knuckles and feet will set firmly enough to slice when cold. Chicken stocks set moderately well; fish fumet rarely gels without added gelatin or a very short, intense extraction. A stock that stays liquid when cold has not extracted enough collagen — more bones, a longer simmer, or a different cut selection is needed.
Fond brun roasting
The roasting stage for brown stock is as important as the simmer. Bones should reach a deep mahogany — not charred black — at 220–240°C before going into the water. The browned bits on the roasting tray should be deglazed with water and added to the pot; they represent the same Maillard flavors that make fond valuable in pan sauces. Many chefs also roast the mirepoix until caramelized before adding it, deepening the stock's color and sweetness.
White stock and blanching
Veal and beef white stocks benefit from blanching: cover bones with cold water, bring to a boil, drain, rinse under cold water, and discard the liquid. This removes water-soluble proteins and blood that would cloud the stock and create gray scum throughout the simmer. Chicken white stock (fond de volaille) is often not blanched; instead, a cold-water start and careful first-hour skimming keeps it clear.