Grease two aluminium tins with 1 tb butter.
In a bowl, toss the apples with the orange zest and juice to coat – set aside.
In a large bowl whisk together oil, milk, egg and vanilla essence.
Whisk in sifted flour, baking powder, salt, 1/4 tsp cinnamon and sugar to form a smooth batter – don’t over mix!
Transfer half cup of cake batter onto apple mixture, stir.
Place apple mixture on the base of your prepared tin.
Top with remaining cake batter.
Mix 1 tb of sugar with remaining cinnamon and sprinkle on top of cakes.
Bake for 20-30 minutes.