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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

Emerils