Pistachios, a member of the cashew family, are a delicious nut. However, they have a very hard shell which can be difficult to open with your bare hands and fingers. A coin is one of the simplest and most inexpensive tools for opening a pistachio shell. This coin method works only if the roasted pistachio has a small gap between the two halves of the shell.
How to Open Pistachios with a Coin
Grip a single pistachio between your thumb and your curled index finger.
Turn the shell so that you can easily insert a thin metal coin into the gap between the two halves of the shell.
Choose a clean coin that will fit into the gap of the shell. If necessary, sanitize the coin as you would any other utensil that will come into contact with your food.
Insert the coin into the gap between the two halves of the shell.
Twist the coin as a lever to separate the two halves of the shell. Enjoy your liberated pistachio kernel.