The Tartare sauce reference article from the English Wikipedia on 24-Apr-2004
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Tartare sauce

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Tartare sauce (also known as tartar sauce) is a thick white sauce made from mayonnaise and finely chopped vegetables (usually including pickled gherkins, capers and pickled onions) which is frequently used to season fish and chips and other fried fish dishes.

Not to be confused with cream of tartar.