Instructions
Bring water to a boil in a medium pot. Season with salt. Add pasta and cook until just before tender.
Drain, reserving about 1 1/2 cups pasta cooking water.
Return pasta to pot and add butter, stirring to melt over low heat. Add pepper and 1 cup pasta water. Add cheese, stirring and tossing until cheese melts and well combined.
Add any remaining pasta water as needed. Season lightly with salt.
Serve warm.
