Tartar sauce (French: sauce tartare; spelled tartare sauce in the UK, Ireland, and Commonwealth countries) is a condiment made of mayonnaise, chopped pickles and relish, caper, and herbs such as tarragon and dill.

Wondering what's in tartar sauce? It's typically made with mayonnaise, chopped pickles or relish, lemon juice, and herbs (like tarragon and dill). There are also a handful of optional ingredients you can add that take the tartar sauce's flavor to the next level. For example, this recipe includes yellow mustard.

Tartare sauce was named by the French after the Tatars of the Eurasian Steppe in modern-day Russia. These are the same Tatars who gave their name to steak tartare, and may have been the originators of the hamburger.