Cider apple
Cider is made in several countries and can be made from any apples. Historically the flavours preferred and varieties used to produce cider have varied by region. Many of the most traditional apple varieties used for ciders come from or are derived from those from Devon, Somerset and Herefordshire in England, Normandy in France, and Asturias in Spain, and these areas are considered to have their own broad cider styles although the many exceptions make this more of a historic footnote. Normandy cider is usually naturally carbonated and clear: Asturian cider apple varieties are mainly 'sharps' or mild 'bittersweets', producing a mildly acidic cider which is customarily served by being poured from height into the glass to oxygenate it.
Cider apple
Polyphenols are an important component of ciders, contributing astringency, bitterness, colloidal stability and colour. The content in apples varies depending on cultivar, production practices, and part of the fruit, with the peel of an apple having more polyphenols than the flesh. The primary polyphenol in apples is procyanidins, followed by hydroxycinnamic acids in the flesh and flavonols in peel. Much of the polyphenols in the fruit are not pressed into the juice, because they bind to polysaccharides in the fruit cell wall, becoming bound to the pomace, when the cell wall is ruptured during the pressing process. Procyanidins are especially prone to binding to the pomace with about 30% extracted into the juice. Cider apples can have five times the total phenolic content compared to dessert apples, but there is a limited supply of bittersweet and bittersharp apples in the U.S. to meet the needs of the fast-growing cider industry. Some cider makers add exogenous tannins to improve phenolic characteristics, and researchers are working on improving polyphenol extraction technology. In countries with more well-established cider industries, such as the U.K. and France, there is an adequate supply of high tannin cider apples. About one half of the apples processed for cider in Europe are bittersweet fruit.