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By Diana Rattray
             
Southern Food Exper, about.com
              
This sponge cake is made with no added fat (besides the eggs), making
 it a relatively low fat cake. Split the cake and fill with a layer or 
jam or preserves and serve with a lightly sweetened whipped cream or a 
low fat whipped topping.
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Ingredients
- 1/4 cup cocoa powder
 - 1/3 cup cornstarch
 - 1/3 cup cake flour
 - 4 large eggs, separated
 - 3/4 cup sugar, divided
 - 1 1/2 teaspoons vanilla extract
 - dash salt
 
Preparation
Heat the oven to 350° F. Spray a 9-inch springform pan with 
nonstick cooking or baking spray and cut out a piece of parchment paper 
or wax paper to fit in the bottom.
Sift the cocoa, cornstarch, and cake flour together into a bowl or onto a sheet of wax peper or parchment paper. Set aside.
In
 a mixing bowl with electric mixer  beat the egg yolks with 1/2 cup of 
the sugar until thick and lemon colored, about 3 to 4 minutes.
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Beat in the vanilla.
In a large bowl, beat
 the egg whites with the salt until soft peaks begin to form. Gradually 
beat in the remaining 1/4 cup of sugar. Beat until firm but soft peaks 
form.
With a spatula, fold the egg yolk mixture into the beaten 
egg whites. Add about 1/3 cup of the flour mixture and fold in . Repeat 
with another 1/3 cup of the mixture, then add the remaining flour 
mixture and fold into the egg mixture.
Spread in the prepared springform pan. 
Bake for 25 to 30 minutes, until the cake is firm to the touch.
Remove
 from the oven and let cool on a rack for 5 minutes. If necessary, run a
 knife around the edge to loosen the cake from the sides of the pan. 
Remove the sides of the pan. Let cool completely.
Split the cake 
horizontally with a long, sharp knife (stick about 6 toothpicks at even 
height around the cake to act as a guide). 
Fill the cake with 
preserves, jam, or fresh fruit. Cut into wedges and top with whipped 
cream. If desired, drizzle with a little chocolate sauce or warm 
preserves or jam.