Preheat the oven to 375F. Peel the carrots. Slice each carrot into 3-inch pieces, then slice each piece in half. If it's a particularly thick part of the carrot you may need to quarter it instead. Aim for pieces that are roughly the same in size.
Toss the carrots with oil and salt. Spread out on a sheet pan, trying not to overlap pieces too much. Roast at 375F for 20 minutes, then remove from the oven.
Meanwhile, in a small bowl, whisk together the harissa, honey, cumin seeds, coriander, and pinch of cinnamon.
Stir the carrots. Toss with honey harissa sauce. I like to use a pastry brush for this part, but you can also just drizzle the sauce and use a spatula to coat.
Return the carrots to the oven to roast until tender and starting to blacken, about 10-15 minutes.
Serve the carrots on a platter with chopped cilantro and crumbled feta.
Video
Notes
Whole carrots: This recipe also works with baby carrots. Just check the carrots starting at the 30-minute mark (after the carrots have cooked with the sauce for 10 minutes) as the baby carrots may roast more quickly.
Harissa is available as "regular" or "spicy". Either works here because we aren't adding any other spicy ingredients.
Cumin seed: I recommend cumin seed because it is very flavorful, but if cumin seed isn't available you can use ¼ teaspoon ground cumin instead.
Keep leftovers refrigerated in a closed container for 3-4 days. Reheat in a skillet over medium heat, sauteing until hot throughout.