Preheat oven to 400 degrees.
Rinse beets, separate different colors, and wrap them with aluminum foil.
Place on center rack and bake until tender, about 45-60 minutes.
Remove from the oven and cool.
Peel beets and cut them in half then in quarters.
Combine remaining ingredients and whisk or shake until well mixed.
Separate lettuce leaves onto 4 serving plates.
Place beets and radish onto lettuce and drizzle with dressing.