For the Gold Beets - Place the gold beets on top of a large piece of foil. Top the them with drizzles of half the amount of olive oil. Add salt and pepper to the beets.
Pull all of the foil edges to the top of the beets to form a “tent”. Then seal the edges be wrapping them together.
For the Red Beets - On another large piece of foil, add the red beets and top them with the remaining olive oil, salt and pepper. Form a tent with the foil and seal the edges.
Roast the Beets - On a small cookie sheet or pizza pan, set both foil tents. Bake in a preheated oven (at 350 degrees F.) until the beets are tender (about 55 minutes; time may vary depending on the size of the beets).
Cool the Beets - Remove from the oven and let the beets cool.
Remove the Skin from the Beets:
When the beets are cool, starting with the gold beets, use a paper towel to rub the skin off. Use a fresh paper towel to rub the skin off of the red beets. Cut the beets into wedges and set aside.
For the Mustard Dressing:
In a medium size bowl, add all of the ingredients and whisk together.
Assemble the Salad:
Greens - In a large bowl, add the greens and about two thirds of the mustard dressing. Using tongs, coat the greens with the mustard dressing. Transfer the greens to serving plates.
Beets - Add the remaining mustard dressing to a small bowl. Starting with the gold beets, dip one wedge at a time in the mustard dressing to coat the wedges with dressing.
Set the beet wedges on the serving plates just to the outside of the mixed greens.
Add the red beet wedges one at a time to the remaining mustard dressing and coat each side. Set the red beets on the serving plates.
Add Blueberries and Serve:
Top the salad with blueberries, a pinch of salt, fresh ground pepper and serve.
Notes
TIPS:
The different colors of beets are prepared and roasted separately so that the red beets don't bleed color onto the gold beets.
The skin on the gold beets is removed first so that color from the red beets doesn't transfer to the gold beets.