Rinse the beets and greens, removing the dirt from the beets with a vegetable scrubbing brush. Cut the greens and stems from the beets, keep them refrigerated.

Preheat the oven to 350 degrees. Place the beets on a sheet pan with paper or in a casserole dish. Bake until they are tender, 50-60 minutes. Remove from oven and let cool. Pop them or peel them out of their skins and dice them.

Cut the stems into small pieces and cut the leaves into large diced pieces. Saute the stems and leaves in a little olive until they turn bright green, about 5 minutes.

Place the greens on a plate. Top with diced beets and crumbled feta cheese. Sprinkle with olive oil and vinegar. Serve warm.