Heat the oven to 350 degrees. Grease a 10 "pan.
In the electric mixer, mix the butter with the sugar and the egg yolks until they are creamy. Then add the vanilla and the cake flour little by little and beating constantly. Beat the whites until stiff and add to the mixture in an enveloping way. Pour the mixture into the pan and bake for 20 to 25 minutes. Let it cool.
Mix the three milks and pour over the cake little by little until all the milk mixture is absorbed.
Beat the egg whites until stiff and add the sugar little by little and then add the cream of tartar. Place the meringue on the cake and bake for 8 to 10 minutes until the meringue is golden brown.
NOTE: Let cool and place in the refrigerator until serving time.