While the pasta is cooking in salted boiling water, make the cream sauce.
In a large pan add the butter and melt, add the zest add the cream, mix to combine, add the salt. Heat on medium / low heat until heated through, do not let it boil. Add the pasta and gently combine, top with half the parmigiano and again gently toss, top with the remaining parmigiano and serve immediately. Enjoy!
Notes
If the sauce feels too thick when you toss it, a splash of starchy pasta water will loosen it without watering the flavor.Store leftovers in an airtight container in the refrigerator for up to 2 days. Reheat gently on the stovetop with a splash of cream or pasta water to loosen the sauce. Do not freeze.