S.R. Tonella Cellars is a Napa Valley artisanal producer focused exclusively on the Rutherford appellation. Steve Tonella (read his bio here) is the proprietor. The winery is the culmination of over 100 continuous years in the wine business in Rutherford, Napa Valley.  It all started with an earthquake.  In 1906 after the great San Francisco earthquake, a…