A dark, glossy, intensely savoury reduction made by simmering equal parts sauce espagnole and brown stock down by half, skimming all the while, until the sauce coats a spoon and shines like lacquer. Neither quite a sauce nor a glaze, it is the concentrated backbone of classical French meat cookery — the mother liquor from which a whole family of small brown sauces is finished.
Demi-glace belongs to the grande cuisine sauce system organised by Marie-Antoine Carême and codified by Auguste Escoffier in Le Guide culinaire (1903), where the brown mother sauce espagnole is refined by reduction with brown stock into this concentrated 'half-glaze'. The name marks its place on a scale between a finished sauce and a glace de viande — a meat glaze reduced still further to a syrupy, near-solid essence. Labour-intensive and slow, it became the hallmark of the professional French kitchen.
A spoonful is profoundly meaty and deep, almost glossy-black, with a long savoury finish and a clean edge from the wine and tomato far back in the espagnole. The texture is syrupy and clinging, coating meat in a mirror-bright film. A little goes a very long way; it is seasoning and sauce at once, never to be ladled like a soup.
Long reduction drives off water and concentrates both flavour and the gelatine that veal bones gave the stock, so the sauce thickens and gains its glossy, lip-coating body from dissolved collagen rather than from added starch. Constant skimming pulls off the fat and impurities the simmer pushes to the surface, leaving the liquid clear; the result is a sauce whose shine and cling come from gelatine concentration — the visible sign of a properly made brown sauce.
Variations
Finished with red wine and a touch of shallot it becomes sauce bordelaise; with Madeira, sauce madère; with Port, sauce au porto; with truffle, sauce périgueux; with green peppercorns, a sauce au poivre vert. Reduced further it passes into glace de viande, and a lighter modern jus lié uses arrowroot in place of the long reduction.
On the Palate
Where Demi-Glace sits in the French flavor cloud
Ingredients
Serves 16How it's made
5 steps · 5 hours
- 15 min
Combine equal volumes of sauce espagnole and brown stock in a wide, heavy pan.
- 28 min
Bring to a bare simmer over medium-low heat, never a rolling boil.
Watch outHold it at a bare simmer, never a rolling boil — a hard boil emulsifies the fat back in and clouds the sauce.
- 3180 min
Reduce slowly by about half over 2 to 4 hours, skimming fat and scum from the surface throughout.
Watch outSkim the fat and scum throughout the reduction — the gloss and clarity come from clean, concentrated gelatin, not leftover grease.
- 430 min
Cook until the sauce is dark, glossy and thick enough to coat the back of a spoon and hold a line drawn through it.
Watch outReduce until it coats the spoon back and a finger-line through it holds — that cling is the sign the gelatin has concentrated enough.
- 58 min
Strain through a fine sieve and adjust seasoning; cool and store, as it sets to a firm jelly when cold.
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