If you want to store a large quantity of nuts, it's best to put them in heavy-duty freezer bags and freeze them. Frozen, they will keep for several months. For shorter storage you can refrigerate pistachios for up to 4 to 6 weeks.

If pistachios stored over a long period lose their natural crispness, you can quickly revitalize them. Just place them on a baking sheet and heat them in the oven at 250 to 300 for 6 to 9 minutes.
If you simply enjoy nibbling on a handful or two of pistachios a day, and are using them up quickly, they can spend a few days sitting in a bowl on your kitchen counter without becoming rancid.

Serving

Part of the pistachio's appeal is the ritual of gathering around a bowl of nuts and cracking them open to retrieve the emerald treasure inside. Pistachios make an ideal snack to serve guests or to enjoy as a between-meal nibble.
What more perfect finish to a satisfying meal could there be than an attractive bowl of fresh pistachios. So inviting, they beckon one to reach out, pluck a singular gem, and begin that joyful process of pulling apart the shell, and finally tasting the rich sweetness of the nutmeat itself.

Raw

Pistachios can be enjoyed whole, chopped, coarsely ground, and finely ground.
Add a few shelled, chopped raw, unsalted pistachios to soups and salads as a garnish, or use one or two handfuls as a main ingredient in a salad dish.
Grind raw unsalted pistachios in an electric coffee grinder and add them to fresh vegetable or fruit juices for a protein boost.
Add raw, unsalted pistachios to the blender when making smoothies.