I had it last night. It comes from the Peter Klas distillery/winery, located on the Mosel river. Klas makes Schnaps from, among other things, forest berries, Riesling grapes, and peaches. It comes in plain 1-liter bottles with screw-on caps, it's completely clear and 80 proof, and it's lusciously fruity without being sweet. A joy to the senses.
Peter Klas is a traditional family business who probably sees having any sort of website as a dangerous concession to modernity, so I'm not sure how I'm going to be able to get more of this stuff. But if you join me in my quest, you won't be disappointed, I promise.