2cups superfine sugar (granulated, fine sugar)
1 1/3cups sifted cake flour
1 1/2cups egg whites at room temperature (I used liquid egg whites)
1 1/2tsp cream of tartar
3/4tsp vanilla extract
Preheat oven to 350 degrees F. Make sure your oven is ready to go or your cake will fall flat.
Combine 1/2cup sugar with the flour and sift together 4 times. This really does make for a light and airy cake so I highly recommend doing this.
Place the eggs whites, salt and cream of tartar in the bowl of an electric mixer and beat with the whisk attachment on high speed until stiff peaks form, approximately 1 minute. With the mixer on medium speed, add the remaining 1 1/2cups of sugar by sprinkling it over the egg whites. Whisk until thick and shiny then add the vanilla extract and whisk until thick, about another minute. Sift the flour mixture into the liquid mixture 1/4 at a time and fold into the batter with a rubber spatula.
Pour the batter into an ungreased 10-inch tube pan, smooth the top and bake 35-40 minutes until it springs back to the touch. I baked mine 45-50 minutes so please watch your time carefully.
Remove the cake from the oven and invert on a cooling rack until completely cool.