Russian dressing is a salad dressing invented in Nashua, New Hampshire, by James E. Colburn, likely in the 1910s. (Colburn first named his experiment Russian mayonnaise, labels for which are today in the possession of collectors and worth tens of thousands of US dollars. ) Typically piquant, it is today characteristically made of a blend of mayonnaise and ketchup complemented with such additional ingredients as horseradish, pimentos, chives and spices.
A variation is known as red Russian dressing, is very much like Catalina / French Dressing.
In The Simpsons episode "The Fabulous Faker Boy", a Russian character claims that everyone in Russia cheats, confessing that "even Russian dressing is just Thousand Island."