Not what it says on the tin.

I've spoken before about things that "everybody knows" which apparently everybody doesn't know.  Well, here's another one - when you go to the chippy and they say "salt and vinegar?" and you say "yes please", what you get is almost certainly not vinegar.  Whether it ever was, I don't know, but since about the middle of the last century, it's probably been something called "non-brewed condiment".  Tastes like vinegar, but is actually a mixture of acetic acid. water and colouring.  Why? - because it's cheaper and quicker to produce than real vinegar.  Theoretically, you're not allowed to call it vinegar, or present it in a traditionally shaped vinegar bottle, but "salt and non-brewed condiment?" doesn't have the same ring, does it?