Russian dressing

Russian dressing is a piquant American salad dressing consisting of mayonnaise, ketchup, and other ingredients. Russian dressing is similar to Thousand Island. Some manufactured versions omit the mayonnaise and are clear rather than creamy, more like French or Catalina. Russian dressing is mentioned as early as 1900 in U.S. sources. It is also documented in a 1910 catering book as an alternative to vinaigrette for dressing tomatoes or asparagus. A 1913 cookbook has a recipe which is a vinaigrette with paprika and mustard. A mayonnaise-based recipe is documented in 1914. The condiment came to be called "Russian" since the original recipe included caviar, a staple of Russian cuisine.

Source: Wikipedia