We harvested the beet crop a couple of days ago. While I was having fun with the tree ( see post in diaries) my wife made pickled beets. She canned five quarts with a few beets left over which we ate for supper.
When we thin the beets they barely have small roots started and we cook the whole thing, roots and greens, they are the best at that stage. We also grow Swiss chard which is related to beets but you only get the greens.