01 - Line a baking sheet with parchment paper to prevent sticking.
02 - In a dry medium skillet over medium heat, toast unsweetened shredded coconut for 2 to 3 minutes, stirring frequently, until lightly golden. Transfer to a mixing bowl.
03 - Using the same skillet, lightly toast the chopped walnut halves for 3 to 4 minutes until aromatic and just golden. Set aside to cool.
04 - Place chopped dark chocolate in a heatproof bowl. Melt over a double boiler or in the microwave using 20-second intervals, stirring until completely smooth.
05 - Add the toasted coconut and walnuts to the melted chocolate and stir until evenly coated.
06 - Drop heaping tablespoons of the mixture onto the lined baking sheet, spacing them apart.
07 - If desired, sprinkle each cluster with a pinch of flaky sea salt.
08 - Refrigerate clusters for at least 30 minutes, or until completely set and firm.
09 - Store the clusters in an airtight container in the refrigerator for up to one week.