Hi! I know this is a ridiculous question: can royal icing be piped onto buttercream? I had always been taught never to pipe or place royal icing directly onto buttercream icing. I'm reading information that's on another website (cake related, I won't say the name) that advises decorators that it's fine to decorate buttercream cakes with royal icing. I would gag if I saw one of my assistants doing this. I feel like my old pastry chefs and instructors would be gagging if they had ever seen me doing this. Can anyone clue me in?