A relish is a cooked, pickled, or chopped vegetable or fruit food item typically used as a condiment in particular to enhance a staple. Examples are jams, chutneys, and the North American "relish," a pickle cucumber jam eaten with hot dogs or hamburgers. 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. Two variants of this are hamburger relish (pickle relish in a ketchup base or sauce) and hotdog relish (pickle relish in a mustard base or sauce). A very popular Polish combination of beets and horseradish ("cwikla") ia a type of relish.
Chow-Chow Relish
Chow-chow is a Nova Scotian and American pickled relish made from a combination of vegetables. Mainly green tomato, cabbage, chayote, red tomatoes, onions, carrots, beans, asparagus, cauliflower and peas are used. These ingredients are pickled in a canning jar and served cold. Chow-chow found its way to the Southern United States during the expulsion of the Acadian people from Nova Scotia and their settlement in Louisiana.
Picalilli Relish
Piccalilli is a British relish of chopped pickled vegetables and spices. British piccalilli contains various vegetables - invariably cauliflower and vegetable marrow - and seasonings of mustard and turmeric. It is used as an accompaniment to foods such as sausages, bacon, eggs, toast, cheese, and tomatoes.
In the Northeastern United States, commercial piccalillis are based on diced sweet peppers, either red or green. This style is very similar to sweet pepper relish, with the piccalilli being distinguished by having a darker red or green colour and like British piccalilli, the chunks are larger and it is tangier and less sweet. It is a popular topping on such foods as hamburgers and hot dogs.
In the Midwestern United States, commercial piccalillis are based on finely chopped gherkins; bright green and on the sweet side, they are often used as a condiment for Chicago-style hot dogs. This style is sometimes called "neon relish."
In the Southern United States, piccalilli is less popular. In its place, chow-chow, a relish with a base of chopped green (unripe) tomatoes is offered. This relish may also include onions, bell peppers, cabbage, green beans and other vegetables. While not exactly similar to other piccalillis, chow-chow is often called as such and the terms may be used interchangeably.