Relleno negro is a traditional dish from the Yucatán region of Mexico, notable for its distinctive black color derived from charred chilies and spices. The dish typically consists of turkey or chicken with ground pork, in a thick, dark sauce made from burnt tortillas, dried chilies, and spices including cloves, allspice, and pepper; see more at recado negro.
The sauce's color and flavor are achieved by toasting and blackening the ingredients before grinding.