How to Make It
Preheat oven to 425°F. Stir together oil, harissa, lemon juice, cumin, kosher salt, paprika, and pepper in a small bowl. Reserve 2 tablespoons oil mixture in a separate small bowl for serving. Arrange carrots on a large rimmed baking sheet. Pour remaining oil mixture over carrots, tossing to coat.
Bake in preheated oven until carrots are tender and starting to char, about 30 minutes, flipping halfway through bake time. Transfer to a serving platter. Drizzle with reserved 2 tablespoons oil mixture. Sprinkle with lemon zest, and garnish with flaky sea salt.