Dried spaghetti is best: I recommend dried pasta instead of fresh pasta, as it has a better texture for cacio e pepe and it has more of a "bite".
Use a microplane: A microplane grater is perfect for finely grated cheese. The cheese melts faster and doesn't clump like shredded or thickly grated cheese would.
Don't skip toasting the pepper: This boosts the flavor, adding more complexity to the flavor of the dish.
Use the skillet: The reason for finishing the dish in a skillet, not in the pasta cooking pan, is residual heat from the pasta pot can cause cheese clumping, which you don't want in your classic Roman pasta dish.
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