Cut beets off from stems and leaves and cut each in half. Place beets in large pot with water. Bring to a boil and boil until the beets are tender, about 20 minutes. Remove beets and after they have cooled a bit, peel them and them cut into small pieces. Also, at this time, chop up the leaves.
In a large saute pan, melt butter over medium heat. Add the beets, greens, and salt. Saute for a few minutes until the greens have wilted. Sprinkle a bit of cracked pepper on top.