I'm really having a problem with this article.
The yuka has a hard skin. What was fun, was taking this hard skin, after peeling way the outer portion of the skin, we, as children, used to take those discarded peelings and cut them into funny teeth and wear them in our mouths. None of us dropped dead from that. We are still around.
Oh, I forgot. The yuca was in its raw state when we would make these "false" teeth and wear them.
Not all varieties of Yuca contain the bitter poison. The poison, Glucoside, can be detected by the bitterness--the stronger the bitterness; the higher concentration of glucoside.
That's because it ISN'T the same thing. Yucca growing in the USA is not the tropical cassava plant used to make manioc. The problem is that in Latin America cassava is also known as yucca. But the yucca in the USA is a spike-leaved plant related to the pineapple, where the cassava plant know as yucca in Tropical America is a leafy bush. Here's a picture of a cassava plant:
Cassava is a perennial woody shrub, grown as an annual.
And a picture of USA yucca plant:
I'm in Alabama, and I have a big mound of yucca growing in the front yard. Nice flowers, but I'm not going to eat any of it!