Like the issue of climate change, the notion that dry riesling exists in this world still has its detractors -- those who believe that riesling is always sweet. Just the other day I found myself explaining the facts about riesling once again to someone who winced when I brought up the wine. For further irrefutable evidence, one need only turn to Trefethen’s delightful 2010 Dry Riesling from the Oak Knoll District of the Napa Valley. For me, this is Trefethen’s signature wine and the 2010, just released at $22, is a refreshing and complex in its aromas and tastes, which include white peach, green apple, orange and touches of ginger and white pepper. A wet stone aroma announces unmistakably that this is riesling. Minerals provide some texture to the long finish. The wine is a natural match for sushi as well as broiled flounder fillets and chicken and makes for a crisp and refreshing aperitif. Alcohol is 12.5 percent. On the back label, Trefethen utilizes a very useful riesling sweetness scale that should be embraced by more in the industry. Based on levels of residual sugar, it tells consumers exactly where a wine stands on a scale from completely dry to very sweet. Received as a press sample.