National Sponge Cake Day is observed worldwide on August 23 each year, celebrating one of the simplest and oldest forms of cake, which dates back to the 17th century. The sponge cake, characterized by its firm yet aerated structure resembling a sea sponge, is made primarily from flour, sugar, and eggs, with some recipes incorporating baking powder. A popular variation is the Victoria sponge, which includes additional fat, typically butter. To create a perfect sponge cake, the batter must be thoroughly beaten to achieve the necessary volume, often involving techniques such as separating eggs and folding in beaten egg whites. This cake-making technique also serves as the foundation for various desserts, including Swiss rolls, Yule logs, and strawberry shortcakes. To celebrate National Sponge Cake Day, individuals are encouraged to bake their own sponge cakes or purchase them from local bakeries.