Tartar sauce is a creamy white mayonnaise-based sauce, typically of a rough consistency. It is often used as a condiment with seafood dishes.It is based on mayonnaise (egg yolk, vinegar or lemon juice, and oil) with some extra ingredients. In the UK recipes typically add to the base capers, gherkins, lemon juice, and tarragon. American recipes may include chopped pickles or prepared green sweet relish, capers, onions (or chives), and fresh parsley. Chopped hard-boiled eggs or olives are sometimes added, as may be Dijon mustard.
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