Melt the dark chocolate over a double boiler until smooth.
In a pan, toast the kadayif pastry until golden brown and crispy, then set aside to cool.
In a mixing bowl, combine the chopped pistachios, powdered sugar, and melted butter to form the pistachio cream.
Slowly mix in the heavy cream into the pistachio mixture until a smooth consistency is achieved.
Fill silicon molds halfway with melted chocolate, use a brush to coat the edges, and let it set slightly.
Add a spoonful of the pistachio cream mixture into each mold, then cover with more melted chocolate to seal.
Refrigerate the chocolate molds until fully set.
Once set, remove the chocolates from the molds and sprinkle the pistachios on top before serving.