- 6 ounces cremini mushrooms
- 3 garlic cloves
- 1/4 cup extra-virgin olive oil
- 1 1/4 pounds skinless boneless chicken thighs, cut into 1/2-inch pieces
- 1 small onion, chopped
- 3/4 teaspoon chopped rosemary
- 3 tablespoons balsamic vinegar
- 1 (28-ounce) can whole tomatoes in juice
- 1/2 pound dried pappardelle
- 5 ounces baby arugula (about 8 cups)
- Accompaniment: Grated Parmigiano-Reggiano
- Pulse mushrooms and garlic in a food processor until finely chopped.
- Heat oil in a 12-inch heavy skillet over medium-high heat until it shimmers. Season chicken with 1/2 teaspoon salt and 1/4 teaspoon pepper and cook, stirring occasionally, until just golden, about 3 minutes. Transfer with a slotted spoon to a bowl.
- Reduce heat to medium and cook onion, stirring occasionally, until softened, about 3 minutes.
- Add mushroom mixture, rosemary, 1/2 teaspoon salt, and 1/4 teaspoon pepper and cook, stirring constantly, until beginning to brown, about 4 minutes.
- Add vinegar and cook until evaporated. Add chicken and tomatoes (with juice), then simmer, breaking up tomatoes with a spoon and stirring occasionally, until sauce is just thickened, about 15 minutes.
- Meanwhile, cook pappardelle in a pasta pot of boiling salted water (2 tablespoons salt for 6 quarts water) until al dente.
- Add arugula to sauce and stir until wilted. Stir in drained pasta and cook 1 minute.