The Beurre Bosc or Bosc is a cultivar of the European pear, originally from France or Belgium. Also known as the Kaiser, it is grown in Europe, Australia, British Columbia and Ontario, Canada, and the northwestern U.S. states of California, Washington, and Oregon.
The Beurre Bosc was cultivated first in Belgium or France. The name Bosc is given after a French horticulturist named Louis Bosc, and "Beurré" means "buttery," referring to the fruit's soft, juicy texture.
Characteristic features are a long tapering neck and russet skin. Famous for its warm cinnamon color, the Bosc pear is often used in drawings, paintings, and photography due to its shape. Its white flesh is denser, crisper and smoother than that of the 'Williams' or 'D'Anjou' pear. It is called the "aristocrat of pears". It is suitable to be used in poaching.