Mr. Ong's Sponge Cake
Instructions
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In a large bowl, beat egg yolks with sugar, baking powder, salt, vanilla, oil, and water. Beat for 20 minutes.
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Add flour. Beat until well incorporated.
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Preheat oven to 375-400°. Grease bottom only of angel food cake pan. Cut parchment paper to fit, and place in bottom of cake pan.
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In a nonreactive bowl (not plastic), beat egg whites with cream of tartar until soft peaks form.
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Fold egg whites into egg yolk batter using a circular motion (folding in one direction only).
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Cook for 45 minutes or until done when tested with toothpick.
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Turn pan with cake in it upside down to cool.
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Slide knife gently around sides of cake pan to release cake.