Masa harina, literally "dough flour," is a fine flour ground from corn kernels that have been soaked in slaked lime. It is used to prepare the doughs for corn tortillas, tamales, and other Mexican corn-based specialties. Caribbean-style masa harina is just very finely ground corn kernels. While the results will taste different, the two types can be used interchangeably in recipes; regular cornmeal, however, is not an acceptable substitute. Prepared masa dough-used for making tortillas and tamales-is available in the refrigerator section of Mexican markets.