Set the pan over a low heat and add the sugar. Stir until the sugar is dissolved. Bring the marmalade to a rolling boil for 10-15 minutes. Skim off any orange scum that rises to the surface.

Set the pan over a low heat and add the sugar. Stir until the sugar is dissolved. Bring the marmalade to a rolling boil for 10-15 minutes. Skim off any orange scum that rises to the surface.