In a double boiler, steam the beets at a rolling boil for about 30 minutes or until they become tender. When done, transfer to cold water and peel off the skin. Slice and add to the salad.
Slice the tomatoes and avocados. Chop up the lemon thyme.
Arrange all of the salad ingredients in a bowl with the mixed greens.
Toss with a desired amount of dressing.
Notes
If you don't have champagne vinegar handy, white wine vinegar works just as well.No lemon thyme? Regular fresh thyme is fine too!