Add the shelled salted and roasted pistachios to the bottom of a large food processor. Begin to blend the nuts. They will tend to collect up the sides of the food processor. You will need to use a rubber spatula to press the mixture down towards the blades gently. Continue to process the nuts like this, scraping down the sides when the mixture collects and blending again. This process will take up to 10 minutes.
Step 2
The mixture will start to come together; it will begin to look dry. Add melted coconut oil and blend again.
Step 3
At this point, taste the mixture, adding any sweetener if you would like, and a pinch of salt. Blend any sweetener into the mixture. Place the finished pistachio butter in an airtight container at room temperature, where it will last for up to 3 weeks.