 Other, nearly identical variations of a "mull" can be made using either catfish, oysters or canned salmon, instead of chicken.Because of its low cost of preparation and reputation as a local comfort food, chicken mull is often served at large social gatherings such as church fellowships, family reunions and community fundraisers.It is a tradition at these gatherings to prepare the mull in a large cast iron or stainless steel pot, often outdoors over an open fire.