Woven Lasagna with Prosciutto and Fresh Spinach Sauce

Weaving the pasta sheets in this lasagna allows the outer pieces to bubble and crisp in the oven around the creamy, rustic prosciutto-ricotta filling. Don’t skip the fresh pasta sheets; their length and texture are key to weaving together this show-stopping dish.To ensure that the pasta dough yields two long, even sheets, this recipe makes a bit of extra dough to allow for generous trimming. Reroll the scraps and cut into enough fresh noodles for a light meal for two. The lasagna needs to set up in the refrigerator for at least six hours and up to a day; the assembled lasagna may be frozen and thawed in the fridge before slicing and roasting. The spinach may be blanched in the pasta water and the spinach sauce may be made up to a day ahead. Once the lasagna has chilled, it takes mere minutes to heat and serve this stunning, cover-worthy recipe, making it ideal for a dinner party. For a version without prosciutto, see Note.