In food preparation, curing refers to various preservation and flavoring processes, especially of meat or fish, by the addition of a combination of salt, sugar and either nitrate or nitrite. Many curing processes also involve smoking. The etymology of the term is unclear, but it is thought to derive from the same Latin cura, -ae, from which the other English meanings are also derived. Curing with salt and sugar may be called salting, salt-curing, sugar-curing or honey-curing. The application of pellets of salt, called corns, is often called corning. Curing in a water solution or brine is called wet-curing or pickling or brining. Paul Bertolli notes that a pickle contains nitrite in addition to salt. (Bertolli 2003) The curing of fish is sometimes called kippering. Technically, ham is the thigh and rump of any animal that is slaughtered for meat, but the term is usually restricted to a cut of pork, the haunch of a pig or boar. Although it can be cooked and served fresh, most ham is cured in some fashion. Ham can either be dry-cured or wet-cured. A dry-cured ham has been rubbed in a mixture containing salt and a variety of other ingredients (most usually some proportion of sodium nitrate and sodium nitrite), Sugar is common in many dry cures in the United States. This is followed by a period of drying and aging. Dry-cured hams may require a period of rehydration prior to consumption. A wet-cured ham has been cured with a brine, either by immersion or injection. The division between wet and dry cure is not always hard-and-fast as some ham curing methods begin wet but are followed by dry aging.