1 lb. short, flat pasta, such as farfalle or sagnarelli
2 oz. Parmigiano-Reggiano, finely grated (about 1 cup); more for serving
Lemon wedges, for serving
Preparation
Bring a large pot of well-salted water to a boil.
Meanwhile, heat 1 Tbs. of the olive oil in a 12-inch skillet over medium-high heat. Add the shallots and cook, stirring occasionally, until starting to soften, 3 to 5 minutes. Add the sausage and cook, breaking it up with a wooden spoon, until browned, 3 to 4 minutes.
Add the kale and pepper flakes, and season with salt and pepper. cook, tossing occasionally, until the sausage is cooked through and the kale is tender, 5 to 7 minutes.
Meanwhile, boil the pasta according to package directions for al dente. Reserve 1/2 cup of the cooking water, and drain the pasta. Add the pasta, the reserved water, and the remaining 1 Tbs. olive oil to the skillet, and toss. Serve topped with the cheese and a drizzle of olive oil, with the lemon wedges and more cheese on the side.