Because it does not need to use standard leavening agents, the air bubbles in whipped egg whites make the cake rise, sponge cake can be made and eaten during Pesach (Passover). So, while there is no religious or symbolic significance to sponge cakes, over time they've become associated with the observance of Pesach in many households.
- AllRecipes' Passover Chocolate Sponge Cake which uses ground almonds instead of wheat flour
- Kosher4Passover has links to multiple cake recipes including several sponge cake recipes, one of which is Cake: Sponge Cake, Basic - pareve from the RFCJ archives posted on Mimi's Cyper Kitchen
- Wikipedia's article on sponge cake