In cooking, a liaison is a thickening agent for soups, sauces and other mixtures. Beurre Manie, Roux, egg yolks or starches such as Flour, Cornstarch and arrowroot are among those agents used for thickening. A liaison is sometimes also referred to as a binder. Egg yolks, butter, flour, and puréed vegetables are all liaisons.
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