Use plenty of salt in your pasta water, as it is the only way to season the noodles themselves. Slice the garlic thinly to ensure it releases maximum fragrance without becoming bitter during the frying process. Do not overcrowd your pan when searing the zucchini, as this prevents browning and causes steaming instead of frying. Gently emulsify the sauce using reserved starchy pasta water to create a creamy coat for the Spaghetti Aglio Olio With Zucchini Recipe. Finish the dish with fresh parsley at the very last moment to maintain a bright, grassy aroma.