Choose a new cookbook worth up to £28 when you subscribe to our magazine.
Heat oven to 200C/fan 180C/gas 6 and bring a large pan of water to the boil. Cut the carrots lengthways into halves or quarters, depending on their size. Tip the carrots into the pan, wait for the water to simmer again, then cook for 4 mins. Drain well, then tip into a large roasting tin.
While the carrots are still hot, gently toss them with all the zest, oil, butter, seasoning and the lemon and clementine slices. Poke the slices in among the carrots, so they’re not left on the edges of the tray. Roast for 40 mins until the carrots are golden and tender.