1. Grease a 26 cm springform tin.
2. Place the butter, sugar and vanilla in the bowl of a freestanding mixer with a paddle attachment and beat on medium speed until creamy. Add the eggs, one at a time.
3. Sift together the flour and baking powder and fold through the butter mixture with the lemon juice.
4. Spread mixture into the flan dish and smooth the top.
5. Cut each apple into quarters and with a sharp knife, score the curved side of each quarter. Press each quarter into the cake mixture core side down, arranging them in a circular pattern until the top is completely covered.
6. Place on shelf level 2 and select Fan Plus at 160°C. Turn off rapid heat up. Bake for 50-60 minutes or until golden. Alternatively cook the apple sponge on Automatic Programmes / Cakes \ Apple sponge and follow the prompts on the screen.
7. Dust with icing sugar to serve.

Dialog oven:

• Place the sponge on shelf level 2 in the Dialog oven and cook the sponge on Automatic Programmes / Cakes \ Apple sponge and follow the prompts on the screen. Alternatively preheat the Dialog oven on M Chef + Conventional heat at 160°C + GU: Medium Intensity + Crisp function ON. Cook for 43 minutes or until golden.

Speed oven:

• Place the sponge on shelf level 1 in the speed oven and cook the sponge on Automatic Programmes / Cakes \ Apple sponge and follow the prompts on the screen.
• Alternatively cook on Microwave 80W + Fan Plus at 160°C for 45-55 minutes, or until golden.