Just what was in that cake of Diane's? LOL!

I cracked up when Victor flipped the table and destroyed EVERYTHING On it but the cake. I sat there, looking at all that shattered glass, and wondering how in the world the cake remained entirely intact. Just what was in it? Maybe it's a good thing Victor didn't eat it - might not have been good when it's so solid that it survives being flipped over and not even the lettering is disturbed.