Sift the flour and baking powder then add to the egg mixture to achieve a uniform batter.divide the batter into 3 and add the pink food color to 2/3 of the batter

Now get your pan,grease,alternatively,add in two spoon/scoop of the pink coloured batter at the center of the pan then 1 spoon of the plain coloured batter(as if making a zebra cake),as you are adding,shake the pan a little to enable the batter settle then continue adding your batter,once your done,put it in a preheated oven then bake.