Fill a large pot with 16 ounces of water and a pinch of salt. Bring the pot to a boil, add cavatappi pasta and cook until al dente, about 8 minutes.
Take pot off heat and transfer to a colander.
Heat 1 tablespoon of butter in a large saucepan over medium heat. Add 1 cup of heavy cream, 6 tablespoons of pesto sauce, and ½ teaspoon of salt to a saucepan and allow to simmer until thickened, about 5 minutes.
Remove saucepan from heat. Add the cooked cavatappi to the sauce. Combine well and enjoy!
Notes
If you have a low tolerance to salt (like me), add 1/4 tablespoon of salt instead of 1/2 tablespoon.