Sounds like the happy couple found a great caterer. It’s not a salad we’ve come across, but, of course, creative people are making new salads and other dishes every day that don’t make it into cookbooks or Internet databases.
From your description, it sounds like you’ve got a better shot at putting together such a salad than we have. But before you launch out on your own, find out who the caterer was, let her know how impressed you were with the entire luncheon and that you’ll refer your friends to her, and, by the way, would she mind sharing with you the recipe for that wonderful salad? She’ll be flattered and maybe you’ll get it.