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Ingredients
  • subheading: Pasta:
  • 4 tablespoons unsalted butter
  • 2 tablespoons neutral cooking oil (such as canola oil)
  • 4 large (12 ounces each) red onions, thinly sliced (about 10 cups)
  • 2 teaspoons kosher salt, divided
  • ¼ cup dry sherry
  • 1 tablespoon all-purpose flour
  • 2 cups unsalted beef or chicken broth
  • 2 tablespoons Worcestershire sauce
  • 1 teaspoon fish sauce
  • ¾ teaspoon black pepper
  • 4 (5-inch) thyme sprigs
  • 1 (2 ½-inch) fresh or dried bay leaf
  • ½ cup Parmigiano-reggiano cheese, grated (about ½ cup packed)
  • 2 ounces Gruyère cheese, shredded (about ½ cup)
  • 1 ( 12- ounce) package bucatini pasta
  • subheading: Gruyère breadcrumbs:
  • 2 tablespoons unsalted butter
  • ¾ cup panko (Japanese-style breadcrumbs)
  • 2 teaspoons fresh thyme leaves, plus more for garnish
  • 1 small garlic clove, grated with a Microplane grater (about ½ teaspoon)
  • ½ teaspoon kosher salt
  • ½ teaspoon black pepper
  • 1 ounce Gruyère cheese, finely grated with a Microplane grater (about ⅔ cup), plus more for garnish
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