I finally made the splurge just for myself: Eiswein from Weingut Debus, region: Rheinhessen, Germany. Grape: Riesling. Should be drunk very cold, around 4 or even 3 degrees Celsius. I drank a sparkling wine from Weingut Debus, which was really excellent. I will look out for more wine from this producer. [Update: The color is the most amazing color I have ever seen in a drink: a deep golden amber. I decided to drink the Eiswein on a hot evening on my rooftop terrace. Despite a bucket of ice, it was difficult to keep the wine cold enough: an uphill battle. The difference in taste between the first cold sip and the last warm sip was enormous. Eiswein is best drunk near a refrigerator. Also: cool the glasses beforehand. It’s a very sweet potent (taste wise) wine. Works fine with white grapes. I also bought some dark chocolate, but the sweetness of the chocolate killed the wine.]
Eiswien is made from grapes which are harvested after frost, at least -8 degrees Celsius, in December or even January. Eiswein has an increased concentration of sugar as a result of freezing out water.