I have Rose’s heavenly cakes book and did the ganache for Bernachon Palet D’or Gateau (supposed to be creme fraiche, but i used sour cream as substitution). I did not do the glaze due to shortage of time, and wanted to add some decorations on it. Piped royal icing words on the ganache, but it ended up melting into the ganache. Can you advise what has gone wrong?
Appreciate your help! Thank you.