It apparently grows like a weed.........to harvest it you get a hoe or trowel and dig straight down to cut the root. The edible part is the root. Just cut out a chunk of the root - it doesn't kill the plant - then wash it, peel it and grate it. But be aware, if you're senstive to cutting onions, this is a heck of a lot worse.
You would have to mention the leaf - now I can't think of the name of it.......LOL!!!
So you know what leaf I'm talking about? My friend couldn't remember the name - they weren't even completely sure it was Cuban.
It looks like a big banana leaf - wide and flat. It's a lovely deep green.