This is a weird wine made by an iconic producer in Germany. Often, producers will branch out from their normal repertoire and make something in addition to the wines which got them famous. For Keller, Riesling is king. Riesling from Keller is normally very dry, crisp, and some of the wines are very rare and collectible. Gruner Silvaner is an esoteric grape that doesn’t differ too much in flavor from Riesling.