Pour the bottle of Chianti into a large pasta pot and add 2 quarts of water. Add a handful of salt and bring to a boil over high heat. Add the spaghetti and cook to just under al dente, about 8 minutes. Do not drain; you will need the pasta liquid for the sauce.
While the pasta is cooking, heat a large skillet over medium-high heat. Add the olive oil and sausage to the hot pan and cook, breaking apart the sausage with the back of a wooden spoon. When the sausage is almost entirely cooked, about 4 minutes, add the shallot and garlic and cook an additional 2 minutes, stirring often. Using tongs or a pasta fork, scoop the pasta directly into the pan with the sausage. Sprinkle with 3/4 cup of the Parmigiano-Reggiano and toss with the tongs to combine. Add the mascarpone, fava beans, 1/4 teaspoon salt, the rosemary and about 1 cup of the pasta cooking liquid. Stir with a wooden spoon to combine, adding more pasta liquid as needed to form a sauce and coat the pasta. Serve sprinkled with the remaining 1/4 cup Parmigiano-Reggiano.
Photograph by Ryan Dausch
How to prepare the fava beans: Remove the beans from their pods. Bring a pot of salted water to a boil. Fill a large bowl halfway with ice and cover the ice with water. Add the beans to the boiling water and blanch for 30 seconds. Drain well and plunge into the ice water to stop the cooking. Peel the white skin from the green bean and discard. The beans are now ready for use.
Reprinted From Giada's Italy: My Recipes For La Dolce Vita By Giada De Laurentiis. Copyright © 2018 By GDL Foods Inc. Published by Clarkson Potter/Publishers, an imprint of Penguin Random House LLC.