metate, metlatl or mealing stone for corn in mexico

america american ancient aztec cereal civilization cob corn craft cultural culture eating edible ethnic farm food four gastronomical gastronomy grain gray handstone health healthy heritage indigenous ingredient kitchen local maize maya mayan mays mealing mesoamerican metate metlatl mexica mexican mexico native nixtamal nixtamalizacion nutritive prehispanic quern quernstone rural stone tool tradition traditional utensil vegetable work zea