Prepare lentils as per instructions on pack. Drain well.
Meanwhile, place the carrots, onion, garlic, cumin, coriander, salt and 2 tablespoons of the olive oil on a baking tray. Cover with foil and cook in a preheated oven for 30 minutes. Uncover and cook for a further 10 minutes.
Add the lentils and roasted carrots to a food processor and process until well combined. Transfer to a serving bowl and stir in the remaining oil. Garnish with coriander.
Season with salt and pepper to taste.