Ingredients
Equipment
Method
- Wash the zucchini and slice them into thin rounds no thicker than 1/8 inch using a sharp knife or mandoline. Do not salt them.
- Pour the olive oil into a large deep skillet and heat over medium-high until the oil shimmers and reaches about 350 F.
- Working in batches, fry the zucchini rounds in a single layer until they turn deep golden on both sides, about 3 to 4 minutes per batch. Do not crowd the pan.
- Transfer the fried zucchini to a paper towel lined plate with a slotted spoon. Layer them with 10 torn basil leaves and let them rest at room temperature for at least 30 minutes, or refrigerate overnight for best flavor.
- Reserve 3 tablespoons of the flavored frying oil and set aside. Discard or save the rest for another use.
- Bring a large pot of water to a rolling boil and add 1 tablespoon kosher salt. Drop in the spaghetti and cook 2 minutes short of the package al dente time, stirring occasionally.
- While the pasta cooks, warm the 3 tablespoons reserved zucchini oil in a wide saute pan over medium-low heat. Add about two-thirds of the fried zucchini and gently mash a small portion with the back of a spoon to release their starches.
- Scoop out 2 cups of the starchy pasta water and set aside. Drain the spaghetti and immediately transfer it to the pan with the zucchini.
- Add 1 cup of the reserved pasta water and the cubed butter. Toss vigorously over low heat for 1 minute until the butter melts into the sauce.
- Remove the pan from the heat completely. Wait 30 seconds so the pan cools slightly, then add the grated Provolone del Monaco and Parmigiano-Reggiano in three additions, tossing and stirring energetically after each to mantecare the sauce. Add more pasta water 1 tablespoon at a time if it looks dry.
- Keep tossing off the heat until the cheese emulsifies into a silky golden cream that coats every strand of spaghetti. This takes 2 to 3 minutes of steady motion.
- Fold in the remaining fried zucchini and season with plenty of freshly cracked black pepper. Taste and adjust salt only if needed, since the cheese is already salty.
- Plate immediately in warm shallow bowls, top with the remaining torn basil leaves, and serve at once while the sauce is still glossy.
