01 - Preheat oven to 400°F. Line a baking sheet with parchment paper.
02 - Using a vegetable peeler or mandoline, cut carrots into long, thin ribbons.
03 - Toss carrot ribbons and red onion slices with 1 tablespoon olive oil, salt, and pepper. Spread evenly on the prepared baking sheet.
04 - Roast for 15–18 minutes, tossing halfway, until carrots are tender and edges are lightly golden. Remove from oven and cool for 5 minutes.
05 - In a large bowl, whisk together remaining olive oil, orange juice, lemon juice, maple syrup, Dijon mustard, salt, and pepper to make the dressing.
06 - Add roasted carrots and onions, arugula, and parsley to the bowl. Toss gently to coat.
07 - Transfer salad to a serving platter. Sprinkle with pumpkin seeds and orange zest. Serve immediately.