I wonder if I bring a subway sub if they would have issue with a tiny container of sauce that could go with it. Once on the sandwhich it is kinda considered part of the SOLID, but if it is still in that little plastic cup thingy, it could be looked at as in the same category as a tiny bottle of hand cream or liquid shampoo or soap. Would they stop me for HOW I wish to eat my food? (not putting the sauce on til I want to eat it, or something?)
Also, I think there SHOULD be a rule against overly pungent foods. Imagine if the guy next to you has like really bad breath cuz he just ate something that stunk up the whole cabin?