Mary Berry’s impressive four-layered clementine cake is bursting with flavour: clementines are used in the cake, the icing and as a decoration. Equipment: you will need two 20cm/8in sandwich tins.

Add the olive oil and beat until light and well combined. Stir in the clementine paste then fold in the ground almonds and baking powder. Spoon the mixture into the tin and bake for 50 minutes or ...