Easiest or best? Easy way is work it with fine sandpaper while rolling it on your lap. Makeshift lathe. Go through grits to about 320, then finish with a fine scotcbrite. Best way is have someone turn it for you on a lathe with rollers. Of course I am sure that many on here will give other advice, more that one means to an end!
Yes, a lot of them are set up to turn cork, lots do it different ways, but they should be able to do a nice job.....its pretty easy