I made pickled beets with some white and red beets from the farmer's market a few weeks ago. I cleaned, dried, rubbed with a bit of oil and roasted them (about an hour I think). Then removed skin and sliced and mixed together with some frenched vidalia.
Brought 1 cup water, 1 cup cider vinegar, 1/2 cup sugar and a heavy dash of salt to boil, then poured over beets.
I just put them all in a large tupperware container. They were good the next day, incredible the next week.
Although after a day or so, they were all the same color of red and I couldn't tell the difference between the two varieties when pickled as you could when roasted.
Jamie