When peeling pistachios, pistachio shell do not worry about the pistachios being closed. During the drying process of pistachios, many pistachios open on their own. Experience has shown that frozen pistachios are much easier to peel.
* High quality pistachio is a pistachio that has opened its door.
Closed pistachios are usually opened by soaking them in water using special devices. This type of pistachio is called "smiling water".
That is, pistachio that has been smiled by this process.
To detect if a pistachio has opened its door or opened it with the help of human intervention, it is enough to hold it in your hand and try to pick them up from the skin of the pistachio if the pistachio was closed by pressing the shells. That is, pistachios are smiling water, but if it was not possible to close the pistachios at all, your pistachios are naturally smiling.