Pipe swirls of pink buttercream all over the top of the cake. Top each swirl with a chocolate shape. Decorate the top of the cake with more sprinkles. Katie decorated the top of her cake with ...

Warning: this is a big cake! It’s made of four separate chocolate sponge cakes. Make each sponge cake one at a time with 4 large eggs, 225g unsalted butter, 225g caster sugar, 175g plain flour ...