This award-winning cake won a blue ribbon at the 2007 State Fair of Texas cake contest!
Preheat oven to 350º.
Sift together the cake flour, confectioners' sugar, and salt; set aside.
In the bowl of an electric mixer fitted with a whisk attachment, whisk the egg whites until frothy; add the cream of tartar and continue beating to soft-peak stage. Gradually adding 1 1/2 cups sugar; whisk until the mixture is stiff but not dry.
Sift one half of the flour/sugar mixture over the egg whites; fold in lightly. Sift the other half of the flour/sugar mixture over the egg whites and fold in lightly.
Pour into the ungreased round tube pan.
Bake for 35 to 45 minutes.
Remove form the oven, invert onto a funnel over a wire cooling rack and cool.
Once cool, turn out of the pan. Ice with the frosting.