Tartare sauce (UK: Tartar sauce) is a thick white sauce made from mayonnaise and finely chopped vegetables, usually including pickled gherkins, capers, olives and pickled onions. It is is frequently used to season fried fish dishes. It can also be made by mixing commercially produced relish and mayonnaise.
- An explanation of the name's origin, from The Straight Dope (http://www.straightdope.com/mailbag/mtartar.html)
- A recipe at Delia Smith's Deliaonline.com
- A definition at Allrecipes.com