Cacio e Pepe

Ingredients (6)

• 1/2 pound spaghetti noodles (8 ounces)
• 2 teaspoons salt
• 11/2 cups freshly grated parmesan cheese finely grated from a block is best
• 2 tablespoons unsalted butter
• 1 teaspoon fresh ground black pepper
• 2 to 4 tablespoons salted and starchy pasta water reserved from the boiling of the spaghetti noodles