Wash the potatoes, leaving the skins on. Put them in a large pot filled with cold water, then bring them to cook over medium-high heat until the potatoes can easily be pierced with a fork. When ready, drain the potatoes.
Peel them then pass them through a potato masher, letting them fall in the bowl of the stand mixer. Let them cool for 5 minutes.
When the potatoes are slightly cool, add half of the flour, egg and pinch of salt. Using the Smeg stand mixer hook, mix on setting 1 until the ingredients are combined.
Flour a work surface with half of the remaining flour, reserving the other half in a corner to use if needed. Put the potato dough on the work surface and roll into a large loaf, then cut into slices like you would a loaf of bread. Roll out each slice into a small looking bread stick, making sure to use a small amount of flour so it doesn’t stick to the work surface. Cut into small pieces.
Bring a large pot of water to boil. Salt the water with 1-2 tablespoons of rock salt and add the gnocchi. Cook until the gnocchi float to the top; 1-2 minutes. Drain.