Wow, was this terrific with the Beef Stroganoff and very simple. Buy a bunch of fresh beets which should be readily available from any grocery or perhaps your local farmers market.
If they are covered in dirt, as mine were, cut off the stem and rinse very well. Peel and using a mandolin, cut to the match stick size. If you don't own a mandolin, slice to 1/4" thick. Cover with water and cook over medium high heat until tender. The matchstick sized beets were done in about 10-15 minutes. Add butter, S&P and serve hot!