Preheat the oven: Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper or aluminum foil for easy cleanup.
- Prepare the beets: Wash and peel the beets. Cut off the tops and roots. Drizzle the beets with olive oil and sprinkle with salt and pepper. Wrap each beet individually in aluminum foil.
- Roast the beets: Place the wrapped beets on the prepared baking sheet and roast in the preheated oven for 40-50 minutes, or until tender when pierced with a fork. Let the beets cool before slicing them into wedges or cubes.
- Make the dressing: In a small bowl, whisk together the olive oil, lemon juice, Dijon mustard, honey (or maple syrup), salt, and pepper until the dressing is smooth and emulsified.
- Assemble the salad: In a large bowl, add the fresh arugula. Top with the roasted beet slices or cubes.
- Add toppings: If using, sprinkle the toasted walnuts or pecans and crumbled goat cheese (or feta) on top of the salad.
- Dress the salad: Drizzle the lemon dressing over the salad and toss gently to combine.
- Serve: Serve immediately as a refreshing side dish, a light lunch, or a starter for your next meal. Enjoy the vibrant flavors and textures!