Boil the shelled pistachios in water for 3 minutes, then drain them and let them dry on a towel. Rub with your hands to easily remove the skins.

Place the peeled pistachios into a food processor, along with sugar and a splash of milk. Blend for about 5 minutes until a smooth paste forms.

Set up a double boiler using a heatproof bowl over simmering water. Add in butter, white chocolate, and the remaining milk, stirring until melted and smooth.

Transfer the pistachio paste to a blender. Pour in the melted mixture and blend until you achieve a glossy, smooth texture.

Optional: Serve with fresh fruit or use it as a filling for pastries for an extra treat!