1. Heat the oil in a pan and soften the carrots for 3-4 minutes on a medium heat.
2. Stir in the butter until it melts through for another 3-4 minutes or until the carrots are tender.
3. Add the sugar and season with a pinch of salt. Continue to stir until the sugar dissolves into the butter mixture.
4. Pour in the orange juice and cook over a high heat for another 4 minutes.
5. Turn down the heat and add the orange zest before serving.