I forgot to include: take the roots home and wash them. They can then be stored for a few days until you are ready to cook them.
Our favorite way to eat Cassava root is to peel it, slice it, and fry it like french fries. Second favorite, boiled and eaten with fried tomato salsa. I also love the leaves boiled (you have to cook them really good), and then sauteed with garlic, shallots, papaya flowers, and lemongrass (recipe to follow).