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Ingredients
  • 1 large, stale loaf crusty sourdough bread (about 1 ¼ pounds), cut into ⅓-inch slices
  • 8 tablespoons (4 ounces) unsalted butter, divided
  • 2 tablespoons extra-virgin olive oil
  • 4 pounds (about 5 large) yellow onions, thinly sliced
  • Fine sea salt
  • 2 tablespoons white-wine vinegar
  • ¼ cup white wine or dry vermouth
  • 5 to 6 cups chicken stock, preferably homemade
  • 12 ounces Gruyère cheese, grated (about 3 cups)
  • 3 ounces Parmesan, finely grated (about 1 ⅓ cups)
  • Freshly ground black pepper
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