Whisk the egg yolk and lemon zest into the butter-sugar mixture.
Slowly stir in the flour mix little by little while whisking vigorously. Should the mixture become too stiff, add some stiff egg white at this stage, otherwise leave until the next stage
Using a clean dry spoon (this is very important as any traces of fat will collapse the egg white), gently fold in the egg white (this will ensure the cake turn wonderfully light and fluffy)
Pour the mixture into the prepared spring loaded baking form
Lightly press in the apple quarters. Do the outside circle first, then the centre. The top of the apples should not be immersed in the dough
Place the cake into the middle of the pre-heated oven on a baking tray. Baking for the prescribed time
10 minutes before the end of baking, place small scoops of the butter, sugar and cinnamon mixture onto the visible piece of apples, returning the cake to the oven to complete baking
Check if the cake is done baking by inserting a skewer. The skewer should come out nice and dry
Once the cake is done, turn off the oven, slightly open the oven door and allow the cake to start cooling for 10-15 minutes before removing from the oven
Slowly stir in the flour mix little by little while whisking vigorously. Should the mixture become too stiff, add some stiff egg white at this stage, otherwise leave until the next stage
Using a clean dry spoon (this is very important as any traces of fat will collapse the egg white), gently fold in the egg white (this will ensure the cake turn wonderfully light and fluffy)
Pour the mixture into the prepared spring loaded baking form
Lightly press in the apple quarters. Do the outside circle first, then the centre. The top of the apples should not be immersed in the dough
Place the cake into the middle of the pre-heated oven on a baking tray. Baking for the prescribed time
10 minutes before the end of baking, place small scoops of the butter, sugar and cinnamon mixture onto the visible piece of apples, returning the cake to the oven to complete baking
Check if the cake is done baking by inserting a skewer. The skewer should come out nice and dry
Once the cake is done, turn off the oven, slightly open the oven door and allow the cake to start cooling for 10-15 minutes before removing from the oven
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