In a food processor, process the pistachio nuts in to a dense flour. Take out just under a 1/4 cup and leave aside for coating.
Add the cacao, prunes, honey and water to the pistachio nuts in the food processor and mix until a dough-like mixture is formed.
Using your hands, roll mixture into small balls.
To finish, coat balls with the extra ground pistachio.
CAUTION: may attract mob of ravenous old folk.