In a wide and deep pan bring 6 cups of water to a boil. Slowly add the polenta, stirring while adding. Simmer stirring often until thick about 20 to 30 minutes.
Taste to see if done. If not soft enough, add a little more water and continue to simmer until softer.
Stir in the butter and cheese until they melt.
When finished, keep over the lowest setting on your cook top.