What vegetable might be called a Worchester? When I was young, my parents would put a vegetable in our stir fry that they called a Worchester. I recently found out that this doesn't actually exist so I've been trying to determine what they were feeding me. My girlfriend thinks they might have been a variety of radish.

I unfortunately don't remember the raw vegetable, by when stir fried it was a white disc about the size of a quarter. It had a very uniform size and color, there was no core like you would see in a parsnip. They were a little crunchy, like a raw apple. The taste was quite unique, I can't compare it to anything, but it was a very mild flavour.

Any ideas what they were?
Sounds like sliced water chestnuts to me, especially with the name similarity.