Step 1

Halve the zucchini lengthwise, then use a spoon to scrape out the seeds. Slice each half lengthwise about ¼ inch thick, then cut the strips crosswise into 1-inch sections. In a large pot, boil 4 quarts of water. Add the pasta and 1 tablespoon salt, then cook, stirring occasionally, until just shy of al dente. Reserve 2 cups of the cooking water, then drain. In a small bowl, combine 1½ cups of the reserved water and the saffron; set aside the remaining ½ cup water.

Step 2

While the pasta cooks, in a 12-inch skillet over medium, cook the pancetta and garlic, stirring occasionally, until the pancetta has rendered some of its fat and begins to crisp, about 3 minutes. Remove and discard the garlic, then stir in the zucchini and ½ teaspoon pepper. Cook, stirring occasionally, until the pancetta is fully crisped and the zucchini is lightly browned, 4 to 6 minutes.

Step 3

Add the pasta and the saffron water to the skillet. Bring to a simmer over medium-high and cook, stirring often, until the pasta is al dente, 4 to 5 minutes. Add the half-and-half and cook, stirring, until the sauce is lightly thickened and clings to the pasta, about 1 minute. Off heat, taste and season with salt and pepper. If needed, stir in additional reserved pasta water 1 tablespoon at a time to create a lightly creamy sauce. Transfer to a serving bowl and top with Parmesan.