I recently attended an event with CasaSugar; at the bar she ordered a glass of Pinot Grigio. The bartender filled her glass halfway with the last of an open bottle. Needing more wine to fill her glass, he quickly grabbed an unopened bottle and went about twisting a corkscrew. However, he failed to look at the bottle and topped her half full glass of Pinot Grigio with Riesling! I was shocked; mixing wine varieties is NOT okay and if ...