Chinese Sponge Cake(Gai Don Go) - cooking recipe

Ingredients

1 1/2 c. Swans Down cake flour, sifted
9 eggs, separated, put yolks in bowl and set aside
1/2 tsp. cream of tartar
1/2 tsp. baking powder
1 c. sugar
1/2 c. water
1/4 c. oil
1 tsp. vanilla (banana)

Preparation

Beat egg whites until slightly foamy, then add 1/2 teaspoon cream of tartar.
Beat again to stiff foam.
Sift together flour, baking powder and sugar, then add to egg yolks.
Then add water, oil and vanilla and beat until creamy.
Pour over egg whites gently; fold until well blended.
Bake at 350\u00b0, in 9 x 13-inch pan approximately 20 minutes and in tube pan 35 to 40 minutes.
Invert tube pan upside down to cool.