For me, it's just plain chocolate. And when I say "plain" I am not being quite honest. I like chocolate that is 85% to 90% cocoa, so there's usually some other ingredient there. I will eat 70% in a pinch, but I don't consider it real chocolate.
I have, on occasion, been known to mix flour, eggs, sugar and baking powder in with my chocolate, but it's not the same :-)