Ingredients

  • 2 tablespoons unsalted butter (1/4 stick)
  • 2 medium garlic cloves, minced
  • 1 medium white onion, small dice (about 1 cup)
  • 7 medium Roma tomatoes (about 2 pounds), cored and coarsely chopped
  • 3 heads Treviso radicchio (about 4 cups), ends trimmed and sliced crosswise into 1/2-inch strips
  • 1/2 cup heavy cream
  • 1 pound penne rigate or ziti pasta
  • 8 ounces fresh mozzarella, small dice (about 1 1/2 cups)
  • 1/2 cup finely grated Parmigiano-Reggiano

Method

  • Heat the oven to 400 degrees F and arrange a rack in the upper third.
  • Bring a large pot of salted water to a boil over high heat.
  • Melt butter in a medium saucepan over medium heat.
  • When it foams, add garlic and onion, season well with salt, and cook until onion is translucent, about 4 minutes.
  • Add tomatoes and let simmer until slightly reduced and thickened, about 10 minutes.
  • Add radicchio and cream and cook until radicchio is wilted, about 5 minutes.
  • Taste and adjust seasoning as necessary.
  • Meanwhile, cook pasta in the salted water for about half the time recommended on the packaging and drain.
  • (Do not rinse.)
  • Set aside.
  • Once the sauce has finished simmering, combine it with the half-cooked pasta and mix until the pasta is evenly coated.
  • Place the pasta mixture in a 13-by-9-inch baking dish and sprinkle the mozzarella and Parmigiano over top.
  • Place in the oven and bake until the mixture is bubbling, the pasta is al dente, and the top is golden brown, about 20 minutes.