Gravenstein

Gravenstein (Danish: Gråsten, meaning "graystone", after Gråsten Palace) is a triploid apple cultivar that originated in the 17th century or earlier. The fruit has a tart flavor, and it is heavily used as a cooking apple, especially for apple sauce and apple cider. It does not keep well, and it is available only in season. This is in part because neither cold storage, nor regular controlled atmosphere keeps the apples' distinctive aroma, although the Nova Scotia Fruit Growers' Association states that "recently however, low oxygen CA storage has shown promise in retaining this harvest-time quality".