I am a big fan of portobello mushrooms, and, as a consequence, I’m always trying to find new ways in which to use them. Last month you saw my Portobello Mushroom Broth as well as my creamy Portobello Mushroom Soup. This month, I’m offering up a wonderful appetizer, snack, or starter in this portobello mushroom dip. It is complex and sophisticated, but easy to make, and because it gets better with age, it is definitely make ahead. Serve with chips, crackers, or crudités, just try not to eat…