FYI info on how to make icewine... they are also made in
Germany.
To make Icewine, the grapes are left on the vine until after the
first frost hits. These grapes are harvested after being frozen in
the vineyard and then, while still frozen, they are pressed. They
must be picked early - before 10 a.m. During both of these
processes the temperature cannot exceed -8 degrees C. At this
temperature (-8 degrees C) the berries will freeze as hard as
marbles. While the grape is still in its frozen state, it is
pressed and the water is driven out as shards of ice. This leaves a
highly concentrated juice, very high in acids, sugars and
aromatics.
Note that the grapes must be naturally frozen otherwise it does not
count as icewine. No artificial freezing is allowed.
