This marmalade is also known as King Family’s Marmalade, after the family of William Lyon Mackenzie King in whose recipe collection it was found. It is especially tasty when made with Seville oranges.
Cut the fruit into thin strips, removing only the pips. Put the fruit into a large mug or basin, cover with water and leave it until next day. Boil until the fruit is soft enough for the head of a pin to go through easily; add the sugar and boil until jellied – about one hour.