6. Cassava
Cassava is not common in mainland US, but it is a staple in tropical countries. It is also known as yuca, manioc, or Brazilian arrowroot. It is a brown root that shows up in grocery stores that cater to ethnic populations.
The cooked root is delicious, but the raw root contains several different types of cyanide. If it is improperly prepared it is quite poisonous. Cassava is a vegetable that is probably best left to people who know what they are doing.
