Laying the cake up With a serrated knife, remove any imperfections in the cake. With the use of a circular cutter, cut the centre of the sponge and pour in 1/4 cup of caramel sauce. Flatten the sides of the cake with a bench scraper. Pour the sauce over the top, allowing it to fill the top and drip down the sides. Decorate the cake with your preferred toppings, such as Choco flakes in this case. And there you have it: Vanilla Caramel Sponge is ready to eat.