Carrots with tarragon and orange

Peel 600g carrots,then cut into batons.Put the carrots in a pan with the grated zest and juice of 1 small orange,25g butterand 1tsp sugar.Add enough boiling waterto cover.Cover with a lid,bring to a simmer and cook for 5 mins.Remove lid,add 1tbsp chopped fresh tarragon and cook,uncovered,5 mins.Drain and serve.