Its distinctively nutty flavor and fragrance make it obvious that this oil is extracted from walnut meats. Walnut oil is expensive and can be found in some supermarkets and most gourmet food stores. A blander, less expensive variety can be found in health-food stores. Store walnut oil in a cool, dark place for up to 3 months. To prevent rancidity, refrigeration is best. Walnut oil is frequently used in salad dressings, often combined with less flavorful oils. It can also be used in sauces, main dishes and baked goods, and for sautéing. The French term for walnut oil is huile de noix. See also fats and oils.