01 - Bring a large pot of generously salted water to a rolling boil. Add the mafaldine and cook until al dente, following the package directions.
02 - Three minutes before the pasta finishes cooking, add the broccoli florets directly to the boiling pasta water.
03 - Scoop out roughly ⅓ cup of the starchy pasta water and set it aside. Drain the mafaldine and broccoli together in a colander.
04 - In a large skillet, warm the olive oil and butter over medium heat. Add the garlic and cook gently for about 1 minute, just until fragrant and softened — avoid letting it brown.
05 - Add the drained mafaldine and broccoli to the skillet. Toss everything together so the noodles and florets are evenly coated in the garlic butter.
06 - Stir in the lemon zest, lemon juice, and heavy cream if using. Splash in the reserved pasta water as needed to loosen the sauce and give it a silky consistency.
07 - Scatter the grated Parmesan over the pasta and toss until the cheese melts into a glossy coating. Season with salt and pepper to taste.
08 - Serve immediately, finished with a shower of fresh herbs and an extra dusting of Parmesan if desired.