For a layer cake

• 750 g unsalted butter
• 2 tsp vanilla extract
• 1050

You’ll need a stand mixer with a paddle attachment or a hand-held mixer with the two attachments (not a stick blender). This is one of the few times when a bowl and elbow grease won’t cut it, I’m afraid!

Put the butter on a plate and microwave on medium for one to two minutes, or until the butter is really, really soft. Check it every 30 seconds: you want to be able to put your finger s