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Stuffing or filling is an edible substance or mixture, normally consisting primarily of small cut-up pieces of bread or a similar starch and served as a side dish or used to fill a cavity in another food item while cooking. Many foods may be stuffed, including eggs, poultry, seafood, mammals, and vegetables, but chickens and turkey are the most common. Stuffing serves the dual purpose of helping to keep the meat moist while also adding to the mix of flavours of both the stuffing and the thing it is stuffed in.
Poultry stuffing often consists of dried breadcrumbs, onion, celery, salt, pepper, and other spices and herbs, a popular herb being sage. Giblets are often used.  Popular additions in the United Kingdom include dried fruits and nuts (notably apricots and flaked almonds),    and chestnuts.  
It is not known when stuffings were first used. The earliest documentary evidence is the Roman cookbook, Apicius De Re Coquinaria, which contains recipes for stuffed chicken, dormouse, hare, and pig. Most of the stuffings described consist of vegetables, herbs and spices, nuts, and spelt (an old cereal), and frequently contain chopped liver, brains, and other organ meat. [ unreliable source?]
In addition to stuffing the body cavity of animals, including birds, fish, and mammals, various cuts of meat may be stuffed after they have been deboned or a pouch has been cut into them. Popular recipes include stuffed chicken legs,  stuffed pork chops,  stuffed breast of veal,  as well as the traditional holiday stuffed turkey or goose.
Many types of vegetables are also suitable for stuffing, after their seeds or flesh has been removed. Tomatoes, capsicums (sweet or hot peppers), vegetable marrows (e.g., zucchini) may be prepared in this way. Cabbages and similar vegetables can also be stuffed or wrapped around a filling. They are usually blanched first, in order to make their leaves more pliable. Then, the interior may be replaced by stuffing, or small amounts of stuffing may be inserted between the individual leaves. 
It is sometimes claimed that ancient Roman and medieval cooks stuffed animals with other animals. An anonymous Andalusian cookbook from the 13th century includes a recipe for a ram stuffed with small birds. A similar recipe for a camel stuffed with sheep stuffed with bustards stuffed with carp stuffed with eggs is mentioned in T.C. Boyle's book Water Music. 
British celebrity chef Hugh Fearnley-Whittingstall has championed the ten-bird roast, calling it "one of the most spectacular and delicious roasts you can lay before your loved ones at Yuletide". A large turkey is stuffed with a goose, duck, mallard, guinea fowl, chicken, pheasant, partridge, pigeon, and woodcock. The roast feeds approximately 30 people and, as well as the ten birds, includes stuffing made from two pounds of sausage meat and half a pound of streaky bacon, along with sage, and port and red wine. 
Almost anything can serve as a stuffing. Many popular Anglo-American stuffings contain bread or cereals, usually together with vegetables, herbs and spices, and eggs. Middle Eastern vegetable stuffings may be based on seasoned rice, on minced meat, or a combination thereof. Other stuffings may contain only vegetables and herbs. Some types of stuffing contain sausage meat, or forcemeat, while vegetarian stuffings sometimes contain tofu. Roast pork is often accompanied by sage and onion stuffing in England; roast poultry in a Christmas dinner may be stuffed with sweet chestnuts. Oysters are used in one  traditional stuffing for Thanksgiving. These may also be combined with mashed potatoes, for a heavy stuffing. Fruits and dried fruits can be added to stuffing including apples, apricots, dried prunes, and raisins. In England, a stuffing is sometimes made of minced pork shoulder seasoned with various ingredients, sage, onion, bread, chestnuts, dried apricots, dried cranberries etc.  The stuffing mixture may be cooked separately and served as a side dish. This may still be called stuffing or it may be called dressing. 
The United States Department of Agriculture (USDA) states that cooking animals with a body cavity filled with stuffing can present potential food safety issues. These can occur because when the meat reaches a safe temperature, the stuffing inside can still harbor bacteria (and if the meat is cooked until the stuffing reaches a safe temperature, the meat may be overcooked). For turkeys, for instance, the USDA recommends cooking stuffing/dressing separately from the bird and not buying pre-stuffed birds. (Stuffing is never recommended for turkeys to be fried, grilled, microwaved, or smoked). 
|Look up stuffing in Wiktionary, the free dictionary.|
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