Here's a suggestion: Order a "special" meal when you book in coach (or FC for that matter). When you get upgraded, call and tell them NOT to cancel the special meal which they will automatically do.
My favorite is the Seafood Platter which usually is some cold shrimp and crab (real thing) meat over a bed of lettuce with a side dressing of some kind. There are other selections.
In over 15 years I have never been dissappointed with this.
Bon Appetite!