This Orange Sponge Cake is a light and fluffy dessert that is perfect for any occasion. Made with a combination of cake flour, egg whites, and fresh orange juice and zest, this cake has a delicate and airy texture that is complemented by the bright and tangy flavor of the orange. The cake is finished with a dusting of powdered sugar and can be served with fresh berries or a dollop of whipped cream for a delicious and refreshing dessert.