01 - Preheat oven to 425°F. Line a baking sheet with parchment paper.
02 - In a large bowl, toss the carrots with olive oil, honey, salt, pepper, and cumin (if using) until evenly coated.
03 - Spread carrots in a single layer on the prepared baking sheet.
04 - Roast for 25–30 minutes, turning once halfway, until carrots are tender and caramelized at the edges.
05 - While carrots roast, toast pistachios in a dry skillet over medium heat for 2–3 minutes, stirring frequently, until fragrant. Remove from heat and set aside.
06 - Transfer roasted carrots to a serving dish. Sprinkle with toasted pistachios, orange zest, and parsley, if using. Serve warm.