mix the flour and the baking powder then put them aside
mix the eggs with the vanilla sugar, lemon zest and the sugar with the electrical mixer for 2 minutes
mix the milk with the water then add them to the mixture the the oil. use the electrical mixer
add the flour mixture to the eggs mixture and mix them with the electrical mixer for 1 minute
put them in its tray
put them in the oven for 45 to 55 minutes on a 180 °c