White Wine by Dr. Loosen from Mosel-Saar-Ruwer, Germany. This vineyard is so steep that, long ago, stone steps were built into the hillside to help workers reach the vines. The iron-infused, red slate soil produces wines that are muscular and complex, with an intense mineral finish. Wines from Erdener Treppchen are more like a powerful, hard-body rock climber than the graceful ballet dancer of Wehlener.