Ingredients
| 300 g flour |
| 250 g sugar |
| 5 whole egg yolks |
| 4 whole egg whites |
| ½ tsp baking powder |
| 175 ml soda water |
| ½ tsp vanilla extract |
| ½ tsp cocoa |
Preparation
Read full directions on A Swoonful of Sugar at http://www.aswoonfulofsugar.com/2012/10/steamed-marble-cake.html
