Wash and boil the beets until tender, 45-60 minutes depending on size. Wash and boil the potatoes until tender, 30-40 minutes depending on size. Chill both with cold water and slip the skins off. Slice beets and potatoes to 1/4" thickness. Finely mince the jalapeno. Thinly slice the red onion. Toss all ingredients in a bowl and serve chilled.