That goes on all the time here in South Texas and Mexico. I guess the Spanish brought it over but not sure. We,they usually have a whole in the ground that is used. Usuall about 2-3' deep. Old school was salt pepper,what ever kind of seasoning ,dry rub. Rap head in century plant leaves,then wet burlap. Fire was started in whole let it burn down to coals remove half of coals and place head in whole ,other half on top. You want at least a foot or more of dirt on top of that. new school is don't use centaur plant just rap in heavy foil ,several layers,no wet burlap. Cow heads were cooked over night,goat heads usually about 4-6 hours. Hardwoods for fire, mesquite .