Weingut Rita und Rudolf Trossen ★ 4.4
Natural-wine pioneers in Kinheim since 1976, the Trossens make slate Riesling with no added yeast; from 2010 the Pyramide Purus line uses no added sulphur.
Tip: The Pyramide Purus Rieslings are the zero-sulphur cuvees; start with a classic bottling to read the slate before the wild ferment.