Puerto Vallarta (PVDN) - How do you make the perfect guacamole? It goes without saying that in my Puerto Vallarta home, there is always guacamole and fresh salsa in the refrigerator because I am the constant host of gatherings for friends. So how do you keep guacamole from turning brown? According to expert cooks, the key lies in the quality of the avocados. A good quality avocado isn't hard to find in Puerto Vallarta, Mexico, but it's so popular…