Ingredients

  • 1/4 cup extra virgin olive oil
  • 2 tablespoons extra virgin olive oil
  • 1 medium onion, thinly sliced
  • salt
  • 1 medium fennel bulb, bulb trimmed,halved,and thinly sliced (about 1 pound, fronds removed, minced, and 1 tablespoon reserved)
  • 2 cloves garlic, finely minced or pressed through garlic press (about 1 teaspoon)
  • 2 tablespoons balsamic vinegar
  • 1/2 teaspoon crushed hot red pepper flakes
  • freshly ground black pepper
  • 1 lb spaghetti
  • 1 lb bright lights chard leaves or 1 lb rainbow chard leaves, stems trimmed and leaves thoroughly washed and coarsely chopped
  • 1/2 cup grated parmigiano-reggiano cheese, plus more for passing at table

Method

  • Heat 1/4 cup oil over medium heat in large skillet.
  • Add onion and 1/4 teaspoon salt and saute (uncovered) over medium heat until softened, about 5 minutes.
  • Stir in sliced fennel bulb and garlic and saute, stirring frequently, until golden, about 10 minutes.
  • Add 3/4 cup water and bring to simmer.
  • Partially cover and simmer over medium-low heat until fennel is tender and liquid has evaporated, about 8 minutes.
  • Stir in vinegar, partially cover, and simmer to blend flavors, about 1 minute longer.
  • Add crushed red pepper flakes and adjust seasoning with salt and pepper.
  • Meanwhile, bring 4 quarts water to boil in large pot.
  • Add 1 1/2 tablespoons salt and pasta; return to boil.
  • After 3 minutes, add chard and return to rapid boil; continue to cook, covered, until pasta is al dente, about 8 minutes.
  • Drain pasta and greens, reserving 1/3 cup pasta cooking water.
  • Toss pasta and greens with fennel mixture, cheese, and two tablespoons extra-virgin olive oil, adding reserved pasta water as needed if mixture is dry.
  • Transfer portions to warm pasta bowls.
  • Garnish with reserved minced fennel fronds.
  • Serve immediately with more cheese passed separately.