Topinambur (aka 'Jerusalem artichoke') is a plant with a funny-looking tuber.
This is one of shapes it takes:
I don't know about this particular one, it is still sitting in my fridge, but the rest of its weirdly shaped fellows i cooked yesterday were quite tasty))) When fried, jerusalem artichoke tastes very similar to fried potatoes.
Also, it is very healthy.
Nature has a sense of humour.))