Preparation:

Bring water to a boil. Add a pinch of salt and cook the spaghetti. Remove 100-200 ml of the water in which they were boiled, strain the spaghetti, pour cold water over it and coat in olive oil. Separately put the spaghetti water on the hob, pour in the cheese and black pepper until the mixture becomes a sauce. Remove from the heat and add the butter of your choice. Pour the sauce over the spaghetti and serve with grated parmesan.