The Best Carbonara | Dinners | Umami

Ingredients

• Kosher salt
• 4 large eggs, plus 2 large yolks
• 1 cup freshly grated Parmesan, plus more for sprinkling
• 1/2 cup freshly grated Pecorino Romano
• 1 tablespoon coarsely ground black pepper
• 2 tablespoons unsalted butter, at room temperature (optional)
• 1 pound spaghetti
• One 12-ounce piece pancetta, cut into matchsticks