Thought you all might appreciate a place that I found two years ago in a town called Martel in the Lot Valley of France (very near to the Dordogne). The place is the "Moulin a l'Huile de Noix", and it is (as the name suggests) a walnut oil mill where they do, indeed, produce walnut oil for sale. They also have a restaurant and we were there on their annual "fete" where for a ridiculously low price we were treated to a several-course meal that was outstanding. It was all relatively simple (for France) but all done to a turn, and served with their homemade walnut wine (of which I bought several bottles and have since learned to make myself). The place was written up some time ago in the U.S. Saveur magazine, and is well worth a drop in.