Beurre Marchand de Vin

Beurre Marchand de Vin — wine merchant's butter — is the compound butter that bridges the gap between a cold butter preparation and a warm sauce, incorporating a concentrated red wine and shallot reduction that gives it extraordinary depth and a distinctive mauve-tinged colour. Where beurre maître d'hôtel is immediate and fresh, marchand de vin is brooding and complex, the ideal partner for robust grilled meats, particularly entrecôte, onglet, and thick-cut bavette. The preparation begins with a reduction: combine 200ml of full-bodied red wine (Cahors, Madiran, or a good Côtes du Rhône) with 2 finely minced shallots, a sprig of thyme, half a bay leaf, and 6 crushed peppercorns. Reduce over medium heat until only 2-3 tablespoons of syrupy liquid remain — this concentration is critical, as it must flavour 250g of butter without adding excess moisture. Strain through a fine sieve, pressing the shallots to extract every drop of flavour, and cool completely. This cooling step is non-negotiable: adding warm reduction to butter will melt it, destroying the emulsion and producing a greasy, split mess. Beat the cooled reduction into softened butter (15-16°C) along with a tablespoon of finely chopped parsley, a squeeze of lemon juice, and seasoning. The butter should be smooth, evenly coloured, and aromatic. Roll in cling film, chill, and slice as for maître d'hôtel. Some chefs add a teaspoon of demi-glace or meat glaze to the reduction for even greater depth. The result is a coin of butter that, when placed on a grilled steak, melts into something approaching a bordelaise sauce in concentrated form — wine, shallot, and butter creating a trinity that has defined French steak cookery for centuries.

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