Black pepper (Piper nigrum) is a flowering vine in the family Piperaceae, cultivated for its fruit, which is usually dried and used as a spice and seasoning. The same fruit is also used to produce white pepper, red/pink pepper, and green pepper.
Black pepper is produced from the still-green unripe berries of the pepper plant. The berries are cooked briefly in hot water, both to clean them and to prepare them for drying. The heat ruptures cell walls in the fruit, speeding the work of browning enzymes during drying. The berries are dried in the sun or by machine for several days, during which the fruit around the seed shrinks and darkens into a thin, wrinkled black layer, the result of a fungal reaction. Once dried, the fruits are called black peppercorns.
White pepper consists of the seed only, with the fruit removed. This is usually accomplished by allowing fully ripe berries to soak in water for about a week, during which the flesh of the fruit softens and decomposes. Rubbing then removes what remains of the fruit, and the naked seed is dried. Alternative processes are used for removing the outer fruit from the seed, including removal of the outer layer from black pepper produced from unripe berries.
In the U.S., white pepper is often used in dishes like light-coloured sauces or mashed potatoes, where ground black pepper would visibly stand out. There is disagreement regarding which is generally spicier. They do have differing flavours due to the presence of certain compounds in the outer fruit layer of the berry that are not found in the seed.
Green pepper, like black, is made from the unripe berries. Dried green peppercorns are treated in a manner that retains the green colour, such as treatment with sulphur dioxide or freeze-drying. Pickled peppercorns, also green, are unripe berries preserved in brine or vinegar. Fresh, unpreserved green pepper berries, largely unknown in the West, are used in some Asian cuisines, particularly Thai cuisine. Their flavor has been described as piquant and fresh, with a bright aroma. They decay quickly if not dried or preserved.
A rarely seen product called pink pepper or red pepper consists of ripe red pepper berries preserved in brine and vinegar. Even more rarely seen, ripe red peppercorns can also be dried using the same colour-preserving techniques used to produce green pepper. Pink pepper from Piper nigrum is distinct from the more-common dried "pink peppercorns", which are the fruits of a plant from a different family, the Peruvian pepper tree, Schinus molle, and its relative the Brazilian pepper tree, Schinus terebinthifolius. In years past there was debate as to the health safety of pink peppercorns, which is mostly no longer an issue. Sichuan peppercorn is another "pepper" that is botanically unrelated to black pepper.
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