Heat the oven to 220˚C / 425˚F. If your carrots have thick skins, peel them. If you have baby or dutch carrots, just scrub them, without peeling. Cut them into similar-sized pieces, about 10cm / 4 inches long and 2cm / 3/4-inch thick.
Place the carrots, chickpeas and red onion on a baking sheet and drizzle over the 1 tablespoon maple syrup and olive oil. Add the cumin and season generously with salt and black pepper. Toss to coat evenly. Roast until the carrots are tender, 20 to 25 minutes. Remove from the oven, drizzle over the remaining 1 tablespoon of maple syrup and toss to combine.
Increase oven temperature to 230˚C / 450˚F (for the lettuce).
Halve the lettuce lengthwise through the core and cut into 5cm / 2-inch chunks. Place on a baking sheet and drizzle with 2 tablespoons of olive oil and season generously with sea salt and black pepper. Roast until the lettuce has softened and charred on top, 10 minutes.
Meanwhile, make whipped herby chickpeas: drain the chickpeas and reserve the aquafaba (bean soaking liquid). Place the chickpeas into a blender or small food processor (I use my Nutribullet) along with 1/2 cup of the aquafaba, herbs, garlic, cumin, lemon juice and season with about 1 teaspoon of salt and lots of black pepper.
To serve, dollop the whipped chickpeas onto a large serving plate and spread it out to cover the surface. Arrange the lettuce on top, followed by the carrots and chickpeas. Season with sea salt and black pepper and scatter over the herbs.