Can someone explain to me why Eri asks the meat and potatoes question in school rumble?

She asked that question because she likes to turn down a guys proposal. Its a trick question, that is, if the guy answers either one (meat and potato stew or curry), he will be turned down either way, so the guy is likely to be dumped. She has that princess attitude so she just turn down guys without any cogent reasons, until Harima probably changed her in some way.