Tartare sauce is a condiment typically served with seafood dishes. It is made from a combination of ingredients, including capers and MAYONNAISE. CAPER is a five-letter word that refers to the pickled flower buds of a Mediterranean shrub, which are often used as a seasoning in cooking. MAYONNAISE is a ten-letter word that is a thick, creamy sauce made from oil, egg yolks, and vinegar or lemon juice. Both capers and MAYONNAISE are common ingredients in tartare sauce.