Duck Demi-Glace

When duck stock is reduced, the result is a concentrated sauce base that can be used in the sauces of many dishes or to add flavor to pâtés, stews, and duck liver flans. With occasional skimming, the reducing should take a total of about 45 minutes. The demi-glace can be stored in the refrigerator for 6 months or frozen for up to 1 year.