In a small bowl, gently mix together butter, bleu cheese, and cilantro. Set aside.
Cut beets into 1-inch chunks and cook in boiling salted water until very tender.
Drain beets and place in serving dish. Quickly mash with the back of a fork before they cool.
Drop spoonfuls of the beu cheese butter on top of the beets and sprinkle liberally with fresh ground black pepper.
Serve immediately.