Antoine-Augustin Parmentier was a french scientist that promoted potatoes as a food source for humans in France and throughout Europe. Any dish that bares his name will be sure to contain a lot of potatoes. This dish is a vegetarian take on Hachis Parmentier which is basically a Shepherd's or Cottage Pie. I made this Mushroom Parmentier from a recipe I once saw on French food at Home on Food Network Canada. If you are a mushroom lover like I am you have to try it. It is rich, delicious and the mushrooms are tender and meaty.