What simple syrup flavor can i use for a yellow cake that has a whipped chocolate ganache filling? (i was planning on using lemon,but not with chocolate, right?) so should i just use vanilla extract? any suggestions?

Coffee, raspberry and orange all go well with chocolate

Here's a thread on simple syrups:

http://cakecentral.com/cake-decorating-ftopict-55178-.html

http://cakecentral.com/cake-decorating-ftopict-65643-.html

HTH