Wonderful side dish. I made it with extra greens and no arugula because that is what I had. It was fantastic, but next time I will add the arugula. I suspect that will make it even better. I used Chioggia beets from the farmer's market. They were amazing.
This was one of those surprisingly awesome dishes! The flavors were outstanding. I sauted sweet onions with the beet greens rather than roasting shallots, skipped the arugula, and used yellow beets from our garden.
We love roasted beets and loved this recipe. The dressing for the beets add just the right amount of flavor. I didn't roast the shallots, but sauteed them with the wilted beet greens. Also omitted the arugula, because there's just the two of us and didn't want a lot of left overs. I 'candied' the walnuts which added a nice touch of sweetness to the salad. This is definitely a keeper.