Bring a large pot of water to a boil over high heat. Before adding the pasta, add about a tablespoon of salt to flavor the water. Add the pasta and cook until the al dente time listed on the box.
While the pasta is cooking, place the pine nuts in a small frying pan over medium heat. Stirring often, toast the pine nuts until they become fragrant and golden brown, about two to three minutes. Set aside.
When the pasta is done cooking, drain it, add the butter, lemon zest, juice, and a few pinches of salt to the pan. Add the pasta back to the pan and stir to combine. Plate the pasta and top it with freshly cracked pepper, parmigiano reggiano and the toasted pine nuts.
