Déglaçage et Jus — Deglazing and Building Natural Roasting Jus

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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.

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