Pickled herring is a traditional dish made from herring fish that has been cured in a vinegar-based brine. This method of preservation enhances the fish's flavor and extends its shelf life. It is commonly enjoyed in various cuisines, particularly in Scandinavian and Eastern European cultures, where it is often served as an appetizer or part of a festive meal. The pickling process typically involves marinating the herring with ingredients like onions, spices, and sometimes sugar, creating a sweet and tangy taste. Pickled herring can be served on its own, with bread, or as part of a salad, making it a versatile addition to many dishes.