How to make
Beat the eggs with the sugar, until a white mixture is obtained. Add the lemonade, oil, yogurt and beat again and then add the flour mixed with baking powder.
Divide the mixture into three parts, put a spoonful of cocoa in both parts and mix, until a homogeneous mixture is obtained.
Grease the cake tin and sprinkle it with flour. Pour the cocoa mixture first, then the white and finally the cocoa.
Bake the sponge cake in a preheated oven at 360°F (180°C), until it is fully baked.
The Marble Lemonade and Yogurt Sponge Cake is ready.