"What are we going to eat?"
Translation:¿Qué vamos a comer?
Cuál and Qué still confuse me as well. I think in this case though it is a difference between saying what and which. Cuál can mean what, but I read somewhere that when asking for preference you usually use Qué unless you are selecting from a list in which case Cuál would translate as which. Not %100 sure so a second opinion would be good.