Trockenbeerenauslese (literal meaning: selected harvest of dried berries) is a German wine term (classification) for a rich, full-bodied style of sweet dessert wine.
A Trockenbeerenauslese wine has the highest level of sugar content in the 'Pradikatswein Category' of the German and Austrian wine classification-scale. Trockenbeerenauslese wines, sometimes referred to as 'TBA' for short, are made from individually selected grapes affected by 'botrytis'. The grapes are individually hand-picked, having shriveled on the vine from the the affect of botrytis, to the point of looking like a raisin while still attached to the bunch.
They are therefore very sweet and have an intensely rich flavour, typically with a nougat or honeyed bouquet, ripe stone fruits such as sweet apricots and nectarines alike.

 

The finest examples are commonly crafted from Riesling grapes, as this varietal retains good levels of acidity even as it becomes extremely ripeness. Other grape varietals used include: Scheurebe, Ortega, Welschriesling, Chardonnay and Gewürztraminer - along with a few others, as they are more prone to noble rot, and they ripen earlier than Riesling.
These wines are rare and expensive due to the labour-intensive method of production, and the fact that very specific climatic conditions (which do not necessarily occur every year) are required to create grapes adequately affected botrytis. They are usually golden to deep golden honey in colour when fermented. The wine is viscous and concentrated, and arguably can be aged almost indefinitely due to the preservative aspect of its high sugar content. Although Trockenbeerenauslese has very high residual sugar level, the finest examples are far from being cloying due to their naturally high level of refreshing acidity.
The style is similar to, but much more concentrated than 'Selection de Grains Nobles' from Alsace in France. In comparison to 'Sauternes', the wines are considerably sweeter, a lower level of alcohol and are usually not oak aged. The minimum sugar content for a Trockenbeerenauslese is 150-154g/L. In exceptional years, top producers can exceed these levels, resulting in a richer, sweeter wine; they can contain 300+ g/L and may approach the very rare 'Tokaji Eszencia' in concentration - enjoy.