Peel the carrots. Cut each one into halves widthways, then each piece in half lengthways. If your carrots are very thick, you may like to cut each piece lengthwise again. Place the carrot pieces in a roasting dish and drizzle with oil.
Squeeze orange juice over carrots, then honey. Sprinkle with S & P, toss carrots to coat. Place some orange slices on top or tuck in between carrots.
Roast in the preheated oven for 40-50 minutes, until the carrots are soft and starting to brown. Serve immediately.