first time I had this it was out of a crinkled plastic water bottle at an osterfeuer. the following morning I had to meet my (now) wife's extended family for the first time. I fell asleep sitting up in the car in the 20 minute drive over. I saw a photo of that day just a year or so ago and my eyes were crimson red

Korn means "grain" in German, so both the name and illustration suggests this is made from fermented grains.

Ich bin ein Korn