Demi-glace is a rich brown sauce in French cuisine used by itself or as a base for other sauces. The term comes from the French word glace, which used in reference to a sauce means icing or glaze. It is traditionally made by combining equal parts of veal stock and sauce espagnole, the latter being one of the five mother sauces of classical French cuisine, and the mixture is then simmered and reduced by half.
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