These little treats are sweetened with dates instead of sugar.
In a food processor, pulse the pistachios until coarse crumbs form. Transfer to a medium bowl. Return the processor bowl to the machine.
In the food processor, pulse the dates, cacao, orange zest, and oil, stopping occasionally to scrape down the sides of the bowl, until smooth. Add the orange juice. Pulse until blended.
Using damp hands, roll teaspoonfuls of the mixture into balls. Roll in the ground nuts until coated. Transfer to a plate. Refrigerate for at least 30 minutes.