Wirelessly posted (BlackBerry: BlackBerry8530/5.0.0.1030 Profile/MIDP-2.1 Configuration/CLDC-1.1 VendorID/417)
There was a (probably apocryphal) story years ago when free meals were still served in Coach on domestic flights. The hayseed passenger apparently mis-heard the flight attendant, and replied, "I'll have the possum."
But back to your issue. I would probably say something like, "How is the chicken (or pasta) prepared? I have dietary issues."