Golden Crunch: Chop the kataifi pastry into small pieces and fluff them to separate the strands. Toast in a pot with butter over medium heat, stirring constantly, until golden brown and crispy. Let cool.
Creamy Pistachio Bliss: Melt white chocolate (and optional oil) in a heatproof bowl. Stir in the pistachio butter and salt, then mix until smooth. Let cool.
Fusion of Texture: Add the toasted kataifi to the pistachio mixture and stir well. If too runny, refrigerate until firm.
Shape and Set: Form 16 small balls (about 1.1 ounces / 30 grams each), place on parchment paper, and freeze until firm.
Choco-Coating Magic: Using two forks, dip the frozen balls into melted dark chocolate, ensuring full coverage. Shake off excess and place on wax paper.
Final Flourish: Sprinkle with chopped pistachios and allow to set before serving.