Bring a large pot of salted water to boil. Add gnocchi.
Cook for about 2-4 minutes or until they float to the top of the pot.
Reserve ¾ cup water. Drain.
Meanwhile place a large pan over medium heat. Add black peppercorns. Stir and toast lightly until aromatic.
Transfer to a mortar and pestle. Grind to a powder.
Add powdered black pepper back to the pan. Add ½ cup pasta water.
Stir to combine. Bring to a boil.
Add cooked gnocchi. Stir.
Combine together pecorino and ¼ cup pasta water in a small bowl. Add cheese mixture to gnocchi.
Let the mixture emulsify and turn thick and silky.
Remove from heat. Garnish with chopped parsley if you like.