Method:

1. Bring the water to a rolling boil. Add the salt and butter, stirring to melt. 

2. Using a wooden spoon, add the cornmeal very gradually, while stirring constantly in the same direction.

3. Simmer over low heat, stirring frequently, until it thickens and starts to pull away from the sides of the pot, about 35 to 40 minutes. 

4. Serve hot.