Begin with bringing a large pot of water to a boil
Once the water is boiling, add a large pinch of salt and cook your pasta according to manufacturers instructions
Zest and juice the lemons and set aside for now
Place a large skillet over medium heat and bring 1 cup of heavy cream to a gentle simmer
As soon as the heavy cream begins to simmer, reduce the heat to medium low and whisk in the lemon zest and half of the butter
As soon as the butter is fully incorporated, whisk in the rest of the butter and remove the skillet from the heat
Reserve 2 cups of the pasta water before draining the pasta
Whisk about 1/2 cup of the pasta water along with the lemon juice into the sauce and as soon as it is creamy and fully incorporated, add the cooked pasta
Toss the pasta in the sauce and add about 3/4 of the finely shredded parmesan and a big pinch of black pepper
Add additional pasta water if the sauce begins to tighten up too much
Divide the pasta between 4 plates and garnish with the remaining parmesan and additional black pepper
Serve immediately