When you think of nuts, it’s easy to picture peanuts in their shells, walnuts with their tough outer casing, or pistachios ready to be cracked open. But have you ever noticed that cashews are never sold in their shells? There’s a fascinating reason behind this mystery, and it has everything to do with the unique—and sometimes dangerous—nature of the cashew.
The cashew’s unusual growth
Unlike most nuts, cashews don’t grow inside the fruit itself. Instead, each cashew nut grows outside the bottom of a cashew apple, a bright yellow or red fruit that looks like a cross between a pepper and a pear. Attached to this fruit is the kidney-shaped cashew seed, housed in a hard shell. While the fruit is juicy and edible (often used in jams, juices, or even fermented into alcohol in some countries), the nut’s shell is where things get tricky.
Toxic shells
The shell of a cashew contains a toxic oil called urushiol, the same compound found in poison ivy and poison oak. This oil can cause skin rashes, irritation, and burns if handled directly. That’s why cashews require careful processing before they’re safe to eat. Workers must steam or roast the cashew shells at high temperatures to neutralize the toxins, and then crack them open with specialized equipment. Because of this, cashews are never safe to sell raw in their shells like other nuts.
Why you’ll only see “raw” cashews after processing
Sometimes you’ll find cashews labeled as “raw” in stores. But even these aren’t truly raw—they’ve already been steamed or roasted to remove the urushiol oil. Without this step, cashews would be far too dangerous to eat. So the next time you snack on a handful of so-called raw cashews, remember they’ve already been through quite a process before reaching your kitchen.
The labor-intensive journey of cashews
Harvesting cashews is a labor-intensive process. The cashew apples are collected, the shells are carefully separated, and then the nuts are steamed, roasted, and peeled by hand in many countries. This demanding process is one reason cashews are often more expensive than other nuts. Their delicate taste and creamy texture, however, make them one of the most beloved snacks and cooking ingredients worldwide.
More than just a nut
Cashews are enjoyed in countless ways—from creamy cashew butter and dairy-free cashew milk to curries, granola mixes, and desserts. Beyond their delicious taste, they’re also packed with nutrients like magnesium, copper, and healthy fats, making them as good for you as they are tasty.
The secret revealed
So, the secret behind why cashews are never sold in their shells comes down to safety. Their toxic coating means they must be processed before being enjoyed. What ends up in your snack bowl is the result of a long, careful journey—from tree to table—making cashews one of the most fascinating “nuts” in the world.