Cashews are delicious, but you'd never know it from looking at a cashew tree — they're quite strange-looking. If seeing one in the wild makes you hesitant to eat the fruit they bear, there's a good reason for that: Cashew shells are toxic. They contain a toxin called urushiol, which triggers a delayed allergic reaction in the form of a painful, itchy rash; urushiol is also found in poison ivy, which, like cashews and pistachios, is a member of the Anacardiaceae family of trees. It's for this reason that cashews are roasted before being sold and consumed, even those labeled as "raw." Doing so removes all traces of urushiol and makes them safe to eat. | 
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