The Argan tree, which only grows in southwestern Morocco, is believed to date back 25 million years. Now endangered and under the protection of the United Nations, the Argan tree flourishes in sandy soil at the edge of the Sahara Desert. In fact, the preservation of this tree, with its deep root system, is vital to protect against erosion. Argan oil, taken from this tree's hard-shelled nuts, has a rich earthy flavor unlike any other nut oil. It's used most often as a finishing oil drizzled over grilled fish or chicken. Combined with lemon juice, Argon oil also makes an excellent salad dressing. Delicious in soups or over grilled Halloumi cheese.