01 - Preheat oven to 400°F. Individually wrap the trimmed and scrubbed beets in aluminum foil and arrange them on a baking sheet.
02 - Roast beets for 40 to 45 minutes, or until tender when pierced with a fork. Remove from oven and allow to cool slightly.
03 - Peel beets while warmed. Slice into wedges or rounds. Use gloves to prevent staining.
04 - In a small mixing bowl, whisk olive oil, balsamic vinegar, Dijon mustard, honey, salt, and black pepper until emulsified.
05 - On a large platter or individual plates, distribute mixed greens evenly. Layer with sliced beets, crumbled goat cheese, toasted walnuts, and red onion.
06 - Drizzle salad with dressing immediately before serving. Toss gently if preferred.