01 - Bring a large pot of generously salted water to a rolling boil. Add the mafaldine and cook according to package directions. Five minutes before the pasta is done, add the broccoli florets to the pot. Cook until the pasta is al dente and the broccoli is tender-crisp. Reserve ⅓ cup of the starchy pasta water before draining in a colander.
02 - While the pasta cooks, warm the olive oil in a large skillet over medium heat. Add the minced garlic and sauté for about 1 minute until fragrant and softened, taking care not to let it brown.
03 - Pour the heavy cream into the skillet and bring to a gentle simmer. Stir in the lemon zest, lemon juice, and Parmesan cheese until the cheese melts and the sauce is smooth. Season with salt and freshly ground black pepper to taste.
04 - Add the drained pasta and broccoli to the skillet with the sauce. Toss everything together thoroughly, adding splashes of the reserved pasta water as needed to loosen the sauce and help it cling to the ribbons of mafaldine. Adjust the seasoning to your liking.
05 - Divide among warmed plates or bowls immediately. Finish with fresh basil leaves, an extra grating of Parmesan, and additional lemon zest if desired. Serve right away while hot.