To truly get a sense of what people are buying, we turned to the beverage director of national chain P.F. Chang's, Mary Melton. People, she said, are looking for something "with that little twist of interest to it." Mary knew she wanted to be in the beverage industry since she was 21 years old. Her 25-year career includes stints as a bartender and wine steward, positions in bar management and also working for small wine distributors. Then in 2005 she started working for P.F. Chang's...