In a pan over low heat, toast the walnuts and roughly chop them into smaller pieces.
In a saucepan, heat up some water to a simmer. Place a glass bowl on top of the saucepan and add dark chocolate and coconut oil. Stir using a spatula until the chocolate melts. Set aside to cool.
Remove the pits from each Medjool date, pipe in several layers of pistachio butter, and add walnuts.