Eiswein is a type of dessert wine produced from grapes that have been naturally frozen on the vine. This process typically occurs in late autumn or early winter when temperatures drop below -7°C (19°F). The frozen grapes are harvested and pressed while still frozen, resulting in a concentrated juice that is rich in sugars and flavors. The production of Eiswein is labor-intensive and requires specific climatic conditions, making it a rare and sought-after wine. It is primarily made in regions like Germany and Austria, where the unique weather patterns allow for the ideal growth and harvesting of the grapes.