Most pistachios are a snap to open, but every bag has a handful of holdouts: Those nuts with just the tiniest opening in the shell, like an obnoxious smirk. No need to ruin your nails or teeth trying to get inside, though! We have two easy ways to crack a tough nut.
The first way is a simple operation: Take one of the discarded shells from your pile. Insert it into the stubborn pistachio's opening and twist. The shell will crack open, and you have your snack.
If that doesn't work, try method number two: Smash it. That's it, just smash it. I use a nearby jar or can, if I'm in the kitchen. On a picnic, you could try a rock. It takes a little practise to find the right amount of force, where you crack the shell but don't obliterate the nut. Still, better to ruin a practise nut or two than throw away a dozen unopenable pistachios.