Heat a cast iron skillet over medium-high heat. Add the butter and warm for 1 1/2 minutes and the butter is melted. Swirl the butter around the bottom of the skillet.
Crack the egg on a flat surface (not the skillet edge) and add to the skillet.
Pour the water around the outside edge of the egg. Cover with the lid.
Sunny side up - Cook 1 1/2 minutes.Over Easy - Cook 2 1/2 minutesMedium - Cook 2 1/2 minutes, remove the lid, flip the egg over and cook an additional 30 seconds, uncovered.