Sauce Marchand de Vin — Red Wine Shallot Reduction

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Marchand de vin — wine merchant's sauce — is the most venerable of French red wine pan sauces, a preparation so fundamental that its name has become shorthand for the technique of building a sauce from wine, shallots, and demi-glace. The method is straightforward but demands precision in reduction: shallots are sweated in the steak pan's residual fat without colour, then a full glass of red wine (Bordeaux traditionally, but any full-bodied red with moderate tannin works) is added and reduced by three-quarters. This is not a gentle simmer — the reduction should be vigorous, concentrating both flavour and body while cooking out the raw tannin that would make the sauce astringent. Demi-glace is then added — equal in volume to the reduced wine — and the sauce is brought to a gentle simmer for 5 minutes to marry the flavours. Finish with cold butter, a squeeze of lemon, and finely chopped flat-leaf parsley. The result should be deep garnet, glossy, and intensely wine-flavoured without any trace of the alcoholic sharpness of under-reduced wine. This is a sauce where the quality of the wine matters — cooking wine produces cooking-wine flavour. Use a bottle you would drink, not necessarily an expensive one, but one with genuine fruit and structure. The sauce is the definitive accompaniment to entrecôte and thick-cut bavette.

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