En vessie refers to a cooking method in which a meat or other dish is cooked in a (pig) bladder. A well-known application is with Bresse chicken: Poularde de Bresse en vessie; a prepared chicken is stuffed with foie gras, truffles, and other flavorings, then enclosed in the bladder and poached in chicken broth. [1] The roots of the recipe go back to Escoffier, and this preparation was made famous by Paul Bocuse among other Lyonnais chefs. [2]
The advantage of the method is that the meat does not come into contact with the cooking liquid; in Poularde de Bresse en vessie, the juices from the chicken all stay in the chicken, and turn into a flavorful jelly if the dish is served cold. [3] The meat remains extremely moist. [4] It has been likened to the cooking method of sous vide where meat is vacuum packed and cooked slowly in a water bath. [5] [6] A similar effect can be achieved by wrapping chicken in aluminum foil. [7]