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French Onion Soup

French Onion Soup Recipe with Gruyère Cheese Toast

French onion soup recipe with caramelized onions, rich beef broth, and crispy Gruyère cheese toast. A comforting French classic full of flavor.
Course Lunch, Soup, Starter
Cuisine French
Prep Time 15 minutes
Cook Time 1 hour 15 minutes
Total Time 1 hour 30 minutes
Servings 4 people
Calories per serving 480 kcal

Ingredients

For the French Onion Soup

  • 2 tbsp unsalted butter
  • 2 tbsp olive oil
  • 2½ lbs yellow onions (1,2 kg) thinly sliced
  • 2 cloves garlic finely chopped
  • ½ cup dry white wine (120 ml)
  • 6 cups beef broth (1,5 l)
  • 1 tbsp worcestershire sauce
  • 1 bay leaf
  • ½ tsp dried thyme
  • salt to taste
  • freshly ground black pepper to taste
  • 8 to 12 slices French baguette
  • 2 handfuls Gruyère cheese grated

Instructions

Prepare the Onions

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

  2. 2. Add the sliced onions and sugar. Cook, stirring regularly, until the onions are deeply caramelized and golden brown, about 40 to 50 minutes.

  3. 3. Add the garlic and cook for 1 minute more.

Build the Soup

  1. 4. Pour in the white wine and scrape up any browned bits from the bottom of the pot.

  2. 5. Add the beef broth, Worcestershire sauce, bay leaf, and thyme.

  3. 6. Bring the soup to a gentle boil, then reduce the heat and simmer for 20 minutes.

  4. 7. Remove the bay leaf and season with salt and black pepper to taste.

Make the Gruyère Cheese Toast

  1. 8. Preheat the broiler.

  2. 9. Arrange the baguette slices on a baking sheet and toast lightly on both sides.

  3. 10. Top each slice with grated Gruyère cheese.

  4. 11. Broil until the cheese is melted, bubbly, and lightly golden.

Serve

  1. 12. Ladle the hot soup into bowls and serve immediately with the Gruyère cheese toast.