Duck or Game, Red Wine–Flavored Demi-Glace

Use this for Duck Liver Flans With Caramel Vinegar Sauce, for Slow-Cooked Duck Legs in Red Wine, or for enriching red wine sauces for game.

Begin 2 days in advance. You can store this demi-glace in the refrigerator for 6 months or frozen for up to 1 year.