Deglazing (déglacer) is the act of adding liquid to a hot roasting pan to dissolve the fond — the layer of caramelised meat proteins and sugars adhered to the pan surface — transforming it into a concentrated, flavourful jus that is the natural sauce for every roast. The fond is the rôtisseur's greatest asset: it represents the Maillard reaction products that fell from the meat during cooking, concentrated by the oven's heat into an intensely savoury glaze. Without deglazing, this flavour is wasted — discarded with the pan. The technique: remove the roast and pour off all but 1 tablespoon of fat (the fat carries flavour but excess fat produces a greasy jus). Place the roasting pan over high heat on the stovetop. Add the deglazing liquid — 200ml of wine (red for beef and lamb, white for poultry and veal), stock, or a combination. The liquid hits the hot pan surface and immediately begins dissolving the fond — scrape vigorously with a wooden spoon or spatula, detaching every fragment. The dissolved fond colours the liquid and infuses it with intense savoury, umami flavour. Reduce by half to concentrate. For a finished jus: strain through a fine sieve, pressing on any mirepoix, and adjust seasoning. For jus lié (lightly thickened jus): whisk in a teaspoon of arrowroot diluted in cold water, or add 100ml demi-glace and reduce until nappant. The jus should be glossy, deeply coloured, and intensely flavoured — 2-3 tablespoons per portion is sufficient. A properly made jus makes a sauce unnecessary; a neglected fond makes the best roast incomplete.
Remove excess fat first — keep 1 tablespoon for flavour, discard the rest Deglaze over high heat — the liquid must boil on contact to dissolve the fond efficiently Scrape aggressively — every fragment of fond is concentrated flavour Reduce by half minimum — the jus must be concentrated enough to coat the meat Strain through a fine sieve — smooth, clear jus is a mark of professional technique
Deglaze in stages: first with wine (to dissolve alcohol-soluble flavour compounds), reduce completely, then with stock (to dissolve water-soluble compounds) — this extracts the full spectrum of fond flavour A splash of aged sherry vinegar or balsamic vinegar in the finished jus adds brightness and lifts the richness Save leftover jus in ice cube trays in the freezer — each cube is a concentrated flavour bomb for future sauces, soups, and risottos
Pouring off ALL the fat — a tablespoon of fat in the jus provides body and carries fat-soluble flavours Deglazing with cold liquid on low heat — the fond dissolves slowly and incompletely Not scraping — the fond remains stuck to the pan and its flavour is wasted Insufficient reduction — the jus is thin, watery, and lacks impact Thickening excessively — a natural jus should flow freely, not coat like a cream sauce; a thin nap is the maximum
Escoffier, Le Guide Culinaire; Larousse Gastronomique