Heat a cast iron skillet over medium-high heat.
Add the butter and warm for 1 ½ minutes until 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 ½ minutes.
Over Easy - Cook 2 ½ minutes.
Medium - Cook 2 ½ minutes, remove the lid, flip the egg over and cook an additional 30 seconds, uncovered.
