Begin by cooking the pasta to al dente, according to the directions on the package. Make sure you reserve some of the pasta water after cooking to use for the sauce.
Stir in the ricotta cheese, black pepper and parmesan cheese. Pour in the reserved pasta water, about ¼ cup at a time if the sauce appears to thick and clumpy.
The lemon ricotta pasta is best when served immediately after cooking. You can eat it the next day as leftovers, but just be aware that the sauce will not be as creamy after sitting in the fridge.