Flour
Cornstarch (Cornflower)

Step One: Measure out the all-purpose flour that you’ll need for your recipe.

Step Two: For every cup of flour you use, take out two tablespoons of flour and return it to the flour bin. Throw the cup of flour (minus the two tablespoons) into a sifter set over a bowl.

Step Three: Replace the two tablespoons of flour that your removed with two tablespoons of cornstarch.

Step Four: Sift the flour and cornstarch together. Sift it again, and again and again. The cornstarch and flour need to be well incorporated and the flour aerated. Sift the flour and cornstarch mixture about five times. Look at that! You just made cake flour!