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Classic French Onion Soup
FrenchMedium

Classic French Onion Soup

A rich, savory soup made with deeply caramelized onions, beef stock, and topped with a toasted baguette and melted Gruyère cheese.

Prep Time

15 min

Cook Time

1h

Servings

4

Ingredients

  • 3 pounds Yellow onions, thinly sliced
  • 4 tablespoons Unsalted butter
  • 2 tablespoons Olive oil
  • 0.5 teaspoon Granulated sugar
  • 0.5 cup Dry white wine (like Pinot Grigio)
  • 6 cups Beef stock
  • 3 pieces Fresh thyme sprigs
  • 8 slices Baguette, sliced into 1-inch rounds
  • 1.5 cups Gruyère cheese, shredded
  • 2 tablespoons Cognac or Brandy(optional)
  • 2 tablespoons All-purpose flour
  • 1 to taste Salt and black pepper

Instructions

  1. 1

    Melt the butter and olive oil in a large heavy-bottomed pot or Dutch oven over medium heat.

  2. 2

    Add the sliced onions and cook for 15 minutes, stirring occasionally until softened.

  3. 3

    Sprinkle in the sugar and continue cooking for 30-40 minutes, stirring frequently, until the onions are deep mahogany brown and caramelized.

  4. 4

    Stir in the flour and cook for 2 minutes to remove the raw flour taste, then deglaze the pot with the white wine, scraping up all the brown bits from the bottom.

  5. 5

    Add the beef stock, thyme, and cognac; bring to a simmer, then reduce heat to low and cook for 20 minutes.

  6. 6

    While the soup simmers, toast the baguette slices in the oven until crisp and lightly golden.

  7. 7

    Remove the thyme sprigs and season the soup with salt and pepper, then ladle into oven-safe crocks or bowls.

  8. 8

    Top each bowl with two baguette slices and a generous layer of Gruyère, then broil for 3-5 minutes until the cheese is bubbly and browned.

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