Heat the oil to 375 degrees F in a pan suitable for frying. Bring the water to the boil.
Drop the pistachios pieces in the water and bring to a boil.
Strain immediately and sprinkle with salt, pepper and powdered sugar.
Mix with a spoon or spatula until the powdered sugar is melted and completely coating the nuts.
Drop the coated nuts into the hot oil and fry until golden brown.
Pour out onto a sheet pan to cool.