Beat egg whites with cream of tartar until foamy, then gradually add 1/4 cup sugar; beat to stiff peaks.
Fold egg whites into the batter in thirds.
Bake the Cake:Spread batter evenly in the prepared pan.
Bake for 10-12 minutes. Check doneness with a light touch or a toothpick.
Cool for 5 minutes, then transfer to a powdered sugar-dusted kitchen towel and roll up to cool completely.
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