"Preheat oven to 325°F (160°C).",

"Beat egg whites with cream of tartar until soft peaks form.",

"Gradually add sugar and continue beating until stiff peaks form.",

"In another bowl, mix egg yolks, milk, and vanilla.",

"Fold in sifted cake flour gently.",

"Carefully fold the yolk mixture into the egg whites.",

"Pour into an ungreased pan and bake for 25–30 minutes.",

"Cool upside-down before removing from the pan."