I lost the log but when I get the two quests from Candi in Arkham and finish the first part (chocolate cake to volarion city) before delivering the shortcake to abdul the armorer the abdul part vanishes from the "quest" log. It also triggered nothing when I gave abdul the cake.
I still could complete the rest of the simon quest though.

You need to do it on the way to Dorothy.

So long, and thanks for all the fish!