Recently, we were in the canteen at work and a colleague, who moved here a few years ago, told that she never had rhubarb before.

Then she asked me, probably just for vocab reasons: Rhubarb is a vegetable?

Uhh...

I had never thought about it. I mean, what the heck is this:
*removed externally hosted image*

Could be a salad, a leafy green. It's kind of similar to celery, but is celery even a vegetable? Well, and of course, rhubarb is often used like a fruit, so uh...

Well, I looked it up, and scientifically, it does count as a vegetable, but colloquially, it's often considered a fruit.