Jugging is the process of stewing whole animals, mainly game or fish, for an extended period in a tightly covered container such as a casserole or an earthenware jug.
In French, such a stew of a game animal thickened with the animal's blood is known as a civet.
One common traditional dish that involves jugging is jugged hare (known as civet de lièvre in France), which is a whole hare, cut into pieces, marinated and cooked with red wine and juniper berries in a tall jug that stands in a pan of water. It is traditionally served with the hare's blood (or the blood is added right at the very end of the cooking process) and port wine.
Jugged Hare is described in the influential 18th-century cookbook, The Art of Cookery by Hannah Glasse, with a recipe titled, "A Jugged Hare," that begins, "Cut it into little pieces, lard them here and there...." The recipe goes on to describe cooking the pieces of hare in water in a jug that is set within a bath of boiling water to cook for three hours. Beginning in the nineteenth century, Glasse has been widely credited with having started the recipe with the words "First, catch your hare". This attribution is apocryphal. Her actual directions are, "Take your Hare when it is cas'd, and make a pudding..." To 'case' means to take off the skin [not "to catch"]. Both the Oxford English Dictionary and The Dictionary of National Biography discuss the attribution.
However, having a freshly caught, or shot, hare enables one to obtain its blood. A freshly killed hare is prepared for jugging by removing its entrails and then hanging it in a larder by its hind legs, which causes the blood to accumulate in the chest cavity. One method of preserving the blood after draining it from the hare (since the hare itself is usually hung for a week or more) is to mix it with red wine vinegar in order to prevent it coagulating, and then to store it in a freezer.