Cook the angel hair according to the package instructions. When the pasta is nearly done, heat the olive oil in a large saute pan over medium heat and add the lemon zest, salt, and pepper and cook until fragrant, about 1 minute. Drain the pasta, reserving 1/4 cup cooking water, if needed. Remove the infused oil from the heat, add the pasta, and toss to coat, adding pasta cooking water, if needed. Grate just a hint of Parmesan on the pasta before serving.