01 - Bring a large pot of generously salted water to a rolling boil. Add the mafaldine and cook according to package directions. When 5 minutes of cooking time remain, add the broccoli florets to the pot. Cook until the pasta is al dente and the broccoli is tender-crisp. Reserve roughly ⅓ cup of the starchy pasta water before draining.
02 - While the pasta cooks, heat the olive oil in a large skillet over medium heat. Add the minced garlic and sauté for about 1 minute until fragrant, 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, Parmesan cheese, salt, and pepper. Let the sauce simmer briefly until the cheese melts and the mixture is smooth.
04 - Add the drained pasta and broccoli to the skillet. Toss everything together thoroughly to coat, adding splashes of the reserved pasta water as needed to loosen the sauce to your preferred consistency. Adjust the seasoning with additional salt and pepper to taste.
05 - Serve immediately in warm bowls, garnished with fresh basil leaves, an extra grate of Parmesan, and additional lemon zest if desired.