How to make
In a bowl, beat the eggs with the sugar. Add the oil and mix well.
Pour the soda into the yogurt and leave it to activate. Add the yogurt to the mixture and mix well again.
Clean, peel and grate the apple.
Mix the baking powder with the flour and sift it. Add the flour to the mixture and mix, until a homogeneous mixture is obtained.
Divide the mixture into two parts. Add the cocoa in one part and the apple in the other.
In a sponge cake tin, which has been greased and sprinkled with flour in advance, pour the white mixture. Pour the brown and the white again on top.
You can stir lightly with a stick to blend the layers.
Place it in a preheated oven at 360°F (180°C) and bake the sponge cake for about 45 minutes.
Check the sponge cake with a toothpick, in order to see if it's ready. Take it out and leave it to cool.
When it's ready, remove it from the cake tin and sprinkle it with powdered sugar.
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