Bring a large pot of salted water to a boil. Add the pasta and cook as the label directs. Reserve 1 1/2 cups cooking water, then drain the pasta. Meanwhile, put the carrots, walnuts, garlic, oregano, lemon zest, 1/4 teaspoon salt and the red pepper flakes in a food processor and pulse until finely chopped. Heat the olive oil in a large nonstick skillet over medium-high heat. Add the walnut-carrot mixture and the raisins and cook, stirring frequently, until the carrots soften and begin to brown, about 5 minutes. Add the reserved cooking water and bring to a simmer, then add the pasta, pecorino, lemon juice, parsley, and salt to taste and toss. Divide among bowls and top with more cheese.
Photograph by Christopher Testani
Recipe courtesy Food Network Magazine