01 - Set the oven to 400°F.
02 - Wrap each beet in aluminum foil and place on a baking sheet. Roast for 35 to 40 minutes until tender when pierced with a fork. Remove from oven, unwrap, and allow to cool.
03 - Once cooled, peel the beets and cut into wedges or cubes.
04 - Heat a dry skillet over medium heat and toast the walnuts for 3 to 4 minutes, stirring frequently until fragrant. Cool before use.
05 - In a small bowl, whisk together olive oil, balsamic vinegar, Dijon mustard, honey, salt, and pepper until fully combined.
06 - Toss the fresh arugula with half the dressing in a large bowl.
07 - Arrange the dressed arugula on a serving platter or individual plates. Top with roasted beets, sliced red onion, toasted walnuts, and goat cheese if desired. Drizzle with the remaining dressing.
08 - Serve the salad immediately for optimal freshness.