According to an article by by Diego Delgado, "The word molcajete (mortar) derives from Nahuatl, the language of the Aztecs: “molli” (seasoning or sauce) and “caxitl” (bowl). The word tejolote (pestle) also derives from Nahuatl: “tetl” (stone) and “xolotl” (doll)."
Foods traditionally prepared in the molcajete include salsas and mole's (mohl-LAY), as well as guacamole. It is also used for grinding chilies, garlic or other herbs and spices for food preparation.