Grilled beet salad

I decided it might be interesting to grill beets, so tonight I tried it. First, I peeled and sliced them into decently trim slices. Then I tossed them with olive oil, fresh orange juice, freshly ground cumin and coriander and salt, removed them from that marinade with a slotted spoon, grilled the beets and used the remaining oil mixture to make the dressing by whisking it with Greek-style yogurt. Overall, I think this was a good idea and would work. However, you know when your bunch is bitter? Sad. Disappointing. My experience tonight. I will try again though because these are pretty and I like the idea of a new way of preparing beets.