01 - Preheat the oven to 400°F. Wrap each beet individually in aluminum foil and place on a baking sheet. Roast for 40-45 minutes, or until tender when pierced with a fork.
02 - Allow the beets to cool slightly, then peel and cut them into wedges or slices.
03 - In a small bowl, whisk together the olive oil, balsamic vinegar, Dijon mustard, honey, salt, and pepper until emulsified.
04 - In a large bowl, combine salad greens and red onion. Drizzle with half the vinaigrette and toss gently to coat.
05 - Arrange the greens on a serving platter. Top with roasted beets, crumbled goat cheese, and toasted walnuts. Drizzle the remaining vinaigrette over the salad and serve immediately.