DS1 will be 8 in April. He is coeliac, on a gf diet. He wants a spongebob squarepants cake. I need a nice recipie for a gf cake that isn't too dry. When I have made cakes in the past, we have used an alternative to marzipan that's made from semolina (none of us can tolerate marzipan, it makes us hurl ). Is there a gf alternative to marzipan? If not, how do you get icing to lay flat on the cake IYSWIM? And is ready made royal icing gf? I haven't a clue, this is his first birthday since being gf. HELP!