A sponge cake is a soft, light cake, especially one made from a batter containing eggs which have been beaten into a foamy consistency.
Sponge cake is a cake based on flour, sugar, and eggs, and is sometimes leavened with baking powder.
A typical sponge cake is made by first mixing the fat with the sugar and then by beating the eggs with the sugar-fat mix, until this is light and creamy, then carefully sieving and folding in the flour.
http://allrecipes.com/recipe/141783/victoria-sponge-cake/
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