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Grapefruit (Citrus Paradisi)
A large citrus fruit with a thick yellow skin and a slightly acid yellow or pink flesh. It"s so named because it grows in clusters like grapes - sometimes over forty fruit on a single stem. The parent plant, was probably introduced to the West Indies by the Spanish from its native Indonesia, where it"s known as the pomelo.
The fruit was called "shaddock" when first introduced to Britain, possibly because it was confused with a similar fruit introduced by Captain Shaddock from the East Indies in 1696; or possibly because the grapefruit we know today hadn"t yet been developed from this fruit. It was popular for ballast in merchant ships, and its acidic properties put to good use for cleaning decks. Modern fruit have been developed to have more sweetness.
As with all citrus fruit, choose heavy examples when purchasing, as they tend to have more juice. See 'Grapefruit, Medicinal uses'