Slice the cooled genoise horizontally, so you have 2 sponges. Trim one of the sponges to an 18cm/7in circle, using a plate or a cake tin as a guide. Arrange the orange slices inside the cling film ...

This week, I caked a zesty Terry's Chocolate Orange slice AND surrounded it with allll the chocolate orange goodies we found on our way home from the UK (how come they get all the good chocolate??) ...