Derived from one of the most popular recipes in the original Cake Stall, the sponge cake is sandwiched with whipped cream and topped with shiny chocolate frosting.
In a mixing bowl, blend the cocoa with the hot water until smooth. Add the butter in pieces and all the remaining ingredients: sugar, flour, baking powder, cinnamon and eggs. Mix together for 2–3 minutes, ideally using a hand-held electric beater, until completely smooth.
Divide the mixture between the prepared cake tins and smooth level. Bake in the preheated oven until the middle of t