International Collection Walnut Oil. Adds a piquant, nutty flavor to salads & vinaigrettes. The full, rich flavor of walnuts enhances grilled & roasted meats. Med Mark™. M. Mediterraneanmark.org. Oils of The World. The International Collection. The International Collection and the Compass Device is a Registered Trademark of AAK UK Ltd, England. www.libertyrichter.com. www.internatinalcollection.co.uk.