The Ice wine, also known by the German word Eiswein, is the wine which is made from frozen grapes or naturally freezed grapes, that get frozen in the own vine. This natural freezing effect prevents the freezing of sugar of the grapes, that fact makes that grapes loses water and it makes the wine sweeter than usual.
The freezing process of ice wine is produced before that actual fermentation, in this process many of the grapes are affected by “noble rot", which is why only a few grapes are acceptable for the production of this wine, besides the fact that there must be done a hard manual classification. As a result only small amounts of strains are obtained for its implementation. So yes, it is an expensive wine. Read more