Combine the masa harina, water and salt in a large mixing bowl, and stir until smooth. The dough should be slightly sticky and form a ball when pressed together. To test, flatten a small ball of dough between your palms. If the edges crack, add water to the dough, a tablespoon at a time, until a test piece does not crack.
c.1997, M.S. Milliken & S. Feniger, all rights reserved