Baked Radicchio and Mozzarella Pasta

Ingredients

• ½ cup finely grated Parmigiano-Reggiano
• 8 ounces fresh mozzarella, small dice (about 1 ½ cups)
• 1 pound penne rigate or ziti pasta
• ½ cup heavy cream
• 3 heads Treviso radicchio (about 4 cups), ends trimmed and sliced crosswise into ½-inch strips
• 7 medium Roma tomatoes (about 2 pounds), cored and coarsely chopped
• 1 medium white onion, small dice (about 1 cup)
• + 2 more ingredients
• • 2 medium garlic cloves, minced
  • 2 tablespoons unsalted butter (¼ stick)

Heat the oven to 400°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 toma...

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