You see all those lovely bubbles. We create those by beating the buttercream. That's what makes it nice and light. And then continue with the rest of the layers.
Some people say to me that their buttercream frosting tastes like butter, it absolutely should not. It should taste like air. And that’s the reason we keep on beating it.
Nice, and then, because it's been setting in the fridge for just a little bit, you don't want it to get completely firm because the buttercream will get hard in the fridge.