I know that this topic has been covered to some extent in the past, most recently in Sharing Food
https://community.ricksteves.com/travel-forum/france/sharing-food
However, after reading through those posts I did not really see where anyone had actually asked at a French restaurant about taking home leftovers. Mostly there were tips on how to avoid having leftovers - e.g. ordering a la carte vs le menu, etc.
We are leaving for a month in France in a few days. I guess my biggest question is, if we are going to order a prix fixe meal (and pay a healthy sum) should we just plan on being pretty hungry because anything we don't eat will be thrown away? We do not want to be disrespectful and we do want to follow local customs. But if it is okay to ask for leftovers to be packaged to take home, we'd like to have that option.
Any advice out there?