For the cake, place the whole orange in a small saucepan, cover with boiling water and boil for 30 minutes, or until soft. Leave to cool. When the orange is cold, cut in half and remove any pips.

Grease a 23cm/9in round deep spring-form cake tin. Shape the dough into a ball and place it into the prepared tin. Cover, or place inside a large plastic bag, and leave to rise for three hours ...