Prep: Preheat oven to 425°F. You will need a rimmed baking sheet. You can line with a sheet of parchment for easy cleanup, but I actually find the carrots caramelize best when cooked directly against the metal.
Season the carrots: In a mixing bowl, whisk together olive oil, harissa paste, maple syrup, smoked paprika, salt, and black pepper. Add in the cut carrots and toss to coat.
Roast: Transfer the carrots to a rimmed baking sheet, arranging them in one layer. Roast for 40-45 minutes. Give them a toss roughly every 10 minutes so they cook evenly. Add extra time as needed until the carrots are tender and caramelized.
Brighten: Once the carrots come out, toss with fresh lemon juice to brighten the flavor.
Serve: I like to serve these carrots on top of a bed of vegan yogurt, vegan whipped feta, tahini sauce, or hummus. (This provides a nice cool counter-balance to the spice of the harissa but it's optional.) Top with crushed nuts for texture, fresh chopped herbs for freshness, and pomegranate arils or dried cranberries for a hint of sweetness/tartness.