Beerenauslese

Beerenauslese is a German language wine term for a late harvest wine with noble rot. Beerenauslese is a category in the Prädikatswein category of the Austrian and German wine classifications, and is a category above Auslese. Beerenauslese wines, often called "BA" for short, are usually made from grapes affected by noble rot, that is "botrytized" grapes. The grapes for Beerenauslese wines are those that have been individually picked. These wines are typically very sweet and rich, and most age very well. The finest Beerenauslese wines are generally considered to be made from the Riesling grape variety, as this retains significant acidity even with the extreme ripeness, which results in a wine where the sweetness is balanced and which has great longevity and which often will improve for decades. These wines are produced in very small quantities when the weather is suitable for the noble rot to form and only in vineyards with appropriate conditions, so they tend to be very expensive. An exception to this is Beerenauslesen produced from more easily ripening grapes such as Ortega or Huxelrebe which have extremely high sugar content, but less noble rot character and less acidity, and therefore tends to come across as less elegant and usually without the potential to improve with cellaring.

Source: Wikipedia