01 - Line a baking sheet with parchment paper.
02 - Using a sharp knife, slice each pitted date lengthwise without cutting all the way through. Gently open each date.
03 - Insert a generous pinch of chopped pistachios into each date. Press the filling gently, then squeeze the date closed to hold the filling.
04 - In a heatproof bowl, combine the chopped dark chocolate and coconut oil. Melt using the microwave in 20-second intervals or set over a saucepan of simmering water, stirring until smooth.
05 - Dip each filled date completely in melted chocolate using a fork. Allow the excess to drip back into the bowl and transfer clusters to the prepared baking sheet.
06 - Sprinkle each chocolate-coated date with chopped pistachios and a pinch of sea salt, if desired, while the chocolate is still wet.
07 - Refrigerate for at least 30 minutes or until the chocolate is fully set.
08 - Transfer the clusters to an airtight container and store in the refrigerator for up to one week.