Kewpie mayo has been one of the predominant household condiments in Japan. It is the most popular brand of Japanese mayonnaise. It is made with egg yolks instead of whole eggs, and the vinegar is a proprietary blend containing apple and malt vinegar. It is a smoother, creamier and slightly sweeter than the regular mayonnaise. It is often used on sandwiches, vegetables and as a salad dressing.