Relish

A relish is a cooked and pickled product made of chopped vegetables, fruits, pickles or herbs and is a food item typically used as a condiment or as a salsa to enhance a staple. Examples are chutneys and the North American relish, a pickled cucumber jam eaten with hot dogs or hamburgers. In North America, the word "relish" is frequently used to describe a single variety of finely-chopped pickled cucumber relish, such as pickle, dill and sweet relishes.
Overview.
Relish generally consists of discernible vegetable or fruit pieces in a sauce, although the sauce is subordinate in character to the vegetable or fruit pieces. Herbs may also be used, and some relishes, such as chermoula, are prepared entirely using herbs and spices. Relish can consist of a single type or a combination of vegetables and fruit, which may be coarsely or finely chopped; its texture will vary depending on the slicing style used for these solid ingredients, but generally a relish is not as smooth as a sauce-type condiment such as ketchup. Relish typically has a strong flavor that complements or adds to the primary food item with which it is served.
Varieties.
This is a list of notable relishes.
In the United States.
In the United States, the most common commercially available relishes are made from pickled cucumbers and are known in the food trade as pickle relishes. Pickle relish is one of the most commonly used spreads in the U.S. Two variants of this are hamburger relish (pickle relish in a ketchup base or sauce) and hot dog relish (pickle relish in a mustard base or sauce). Another readily available commercial relish in the U.S. is corn (maize) relish. Heinz, Vlasic, and Claussen are well known in the U.S. as producers of pickled cucumbers and pickle relishes. Chicago-style relish is a sweet pickle relish that is a standard ingredient on the Chicago-style hot dog. Pickle relish is an important ingredient in many varieties of the U.S. version of tartar sauce.
Outside the United States.
Hot dog relish is commonly served with Chilean "completos" (local slang for hot dog), being generically known as "salsa americana" (American sauce) or simply referred to as "americana".