This is made from an Italian meringue, which produces a stable and very silky buttercream. It’s perfect for show-stoppers such as wedding cakes and is one of my favourite buttercreams for piping, because it is very easy to work with. You can also make it well in advance. It takes a little bit of time, but the end result is worth it! As a guide, this makes enough buttercream to cover a two-layer 20cm cake.