These heart veggies can be cooked using almost any method you would normally use for the vegetables in question, but we recommend steaming them as the best way to cook them without damaging their appearance.
To speed the cooking process, you can carefully slice them to reduce their thickness by half. It may even be possible to use a mandoline to cut thin slices for other applications.
Once they are tender, you can serve them as you would any other beets, potatoes, turnips or rutabagas. If you would like to serve them with a sauce (for example the potatoes with gravy), consider putting the sauce under them (instead of on top) in order to better show them off.