# Whisk the mixture of the eggs and sugar
until it turns to white.
# Add the liquid ingredients which are oil and mineral water at first, and mix.
# Add flour
, baking powder and vanilla in it and mix until get a smooth mixture.
# Place 1/3 of the mixture into a separate bowl, add cocoa
in it and mix.
# Superpose 2 tbsp white mixture and 1 tbsp cocoa
mixture on the cake mould which dont have a hole in the middle.
# Repeat these actions until finishing all of the ingredients, and bake it in 356 F oven for 1 hour.