For an extra touch of flavor, consider adding a lemon zest to the batter. If you don't have cake flour, you can make your own by using all-purpose flour and substituting 2 tablespoons of all-purpose flour with 2 tablespoons of cornstarch per cup. To prevent the top of the cake from browning too much, you can tent it with aluminum foil during the last 15 minutes of baking. Store the cooled cake in an airtight container at room temperature for up to 3 days.