Did I poison my soup with cassava?

I ran into a recipe that called for adding cassava and boiling with goat meat until tender. I've never cooked cassava before, so I followed the recipe. It's been stewing for some time now, but the cassava still tastes bitter, and now I've seen a site that claims the liquid it's cooked in is... show more I ran into a recipe that called for adding cassava and boiling with goat meat until tender. I've never cooked cassava before, so I followed the recipe. It's been stewing for some time now, but the cassava still tastes bitter, and now I've seen a site that claims the liquid it's cooked in is poisonous. Is this true?
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