black radish

:  a black or brown-skinned radish with pungent white flesh It calls for black radishes, which have black or dark-brown skin and can grow to the size of small turnips. — David Hagedorn, Washington Post, 13 Aug. 2008 Black radishes can be almost as pungent as horseradish, and are firm and rather dry; in short, nothing like the juicy-crisp ladylike scarlet beauties … — Elizabeth Schneider, Uncommon Fruits & Vegetables, 1986 The black radish with crisp, white flesh, is gaining popularity outside its native Eastern Europe. — The Encyclopedia of Herbs, Spices, & Flavorings, 1992