Gratinee Lyonnaise - Lyon-style Onion Soup

Ingredients

  • 4 tablespoons unsalted butter
  • 3 pounds yellow onions, thinly sliced
  • 1 1/2 teaspoons salt
  • 1/2 teaspoon freshly ground black pepper
  • 1/3 cup cognac
  • 8 cups beef stock or broth
  • 4 sprigs fresh thyme, tied into a bundle with kitchen string
  • 1/2 loaf French bread, cut into 1/2-inch thick slices
  • 1 pound Gruyere cheese, coarsely grated
  • 2 egg yolks (optional)
  • 1/2 cup Port wine (optional)
  • Finely chopped parsley, garnish

Description

Gratinee Lyonnaise - Lyon-style Onion Soup

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