I've been getting through my home-grown carrots lately. I've had a few raw, and twice now I've noticed solid chunks in the top of the carrot. The first time when my teeth crunched on it I figured it was a piece of plastic the carrot had grown around. It was a piece about 5mm², solid, and a translucent whitish colour.
It happened again just now, so I'm thinking maybe it's not plastic. And if it's not, then what else might it be? Some kind of crystallization?