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Peel and cut the carrots into batons. (You can do this up to 24 hours ahead and keep them in a polythene bag in the fridge.) Tip them into a pan, pour in enough boiling water just to cover, bring back to the boil, then put a lid on the pan and cook for 4-5 minutes until the carrots are just tender.
Meanwhile, put the butter and maple syrup in a small pan. Heat until the butter is melted then stir in the mustard. Take off the heat. Drain the carrots and tip into a warmed serving dish.
Pour the warm maple glaze over the carrots. Taste and adjust seasoning to suit.