From Winespeed, this is an article about Eiswein: Even though Ontario’s wineries have only been making commercial ice wine since the 1980s, today they average a total of 224,500 gallons (850,000 liters) produced annually. Ice wine, however, has been around since at least 44 AD when the Roman writer Pliny reported on wines made from frozen grapes. In Germany, where it is known as eiswein, the sweet elixir is documented for the first time in 1830. After a sudden frost, winegrowers discovered it while attempting to save their grape harvest rather than feed the frozen grapes to their livestock, as was typical until then. Canadian ice wine is made from very ripe grapes of at least 35° Brix (in Germany, grapes need only reach 26-30° Brix depending on the region) that have frozen naturally
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