French-style buttercream is made in the same way, but with the addition of egg yolks, which produce a much richer icing. If the mixture splits or curdle instead of emulsifying, stick the bowl in ...

For the buttercream, beat the butter in a large bowl until soft. Add half of the icing sugar and beat until ... To assemble, choose the sponge with the best top, then put the other cake top ...