Cook the angel hair (or pasta of your choice!) according to the directions. Make sure to boil it in salted water! You want to reserve about 1 ½ cups of the starchy pasta water once it’s finished cooking.
Zest the lemon rind and juice the lemon into a bowl.
Place the lemon zest and heavy cream in a skillet or pot and heat over medium heat. Whisk the mixture often and bring it to a simmer – this will only take 1 or 2 minutes. Turn the heat down to low and whisk in the butter 1 tablespoon at a time. You want the sauce to be creamy and slightly thickened.
Increase the heat to medium-low and whisk in ¾ cup of the pasta water and lemon juice. Place the pasta into the cream sauce and toss it well, using kitchen tongs to turn it over and coat the strands. Add the pecorino and continue to toss. If the sauce isn’t creamy enough, add in more of the pasta water a few tablespoons at a time until it’s reaches the desired consistency.
Sprinkle on lots of freshly cracked black pepper and extra cheese.
If desired, you can garnish with some fresh chopped parsley or lemon twists!