Start by heating the pasta water. Bring it to a boil and season with salt.Plunge the pasta into the water and cook for 1 to 2 minutes less than the stated cooking time.
Meanwhile, wash the organic lemons and remove the zest with a microplane zester.Heat the butter in a large skillet over low heat.Add the lemon zest and juice of one lemon. Continue cooking over low heat.
When pasta is cooked, remove one cup of the cooking water.Drain it and pour it into the pan with the lemon butter. Stir while continuing to heat over low heat.
Add the grated Parmesan cheese and some of the cooking water, while stirring.A creamy sauce will form and coat your pasta. Add more cooking water until you get the desired creaminess to your sauce.
Serve immediately and season generously with pepper.