Scrub the beets and wrap them in a couple layers of aluminum foil. Place them in a medium hot oven until tender. This can take a couple hours.
Remove from oven and allow them to cool until you can handle them. Slough off the peels and cut them into slices or smallish chunks.
Dress the beets with the vinegar, oils, 1/2 the freshly squeezed orange juice and salt to taste.
Prepare the yoghurt dressing by combining the yoghurt, remaining half of the orange juice & zest, and a squeeze of mild flavored honey.
At this point the beets and dressing may be refrigerated up to a day and assembled just before serving.
To assemble, place the beets in a shallow dish, pour the yoghurt into the middle and sprinkle with coarsely chopped pistachios. Serve and enjoy!