Peel the butternut squash, dice it into small cubes, and place it on a baking sheet lined with parchment paper.
Cut the cauliflower into florets and add them to the baking sheet with the butternut squash.
Drizzle with olive oil, season with salt and pepper, and roast in a preheated oven at 400°F (200°C) for 25 minutes, or until the vegetables are golden brown and tender.
Toast the walnuts in a dry skillet over medium heat for 3-4 minutes, until fragrant. Roughly chop them.
Thinly slice the red onion.
In a small bowl, whisk together the balsamic vinegar, honey, and one tablespoon of olive oil.
In a large salad bowl, arrange the arugula, roasted butternut squash, cauliflower, and red onion.
Sprinkle with the toasted walnuts, drizzle with the dressing, and gently toss to combine.
Serve immediately. This salad is best enjoyed fresh.
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