Europe Vegetarian Recipes

Classic Comfort Dish-French Onion Soup with Gruyere Croutons Recipe

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Vegetarian – Europe

French Onion Soup with Gruyère Croutons Recipe

Introduction: French Onion Soup is a classic comfort dish that combines the sweetness of caramelized onions with the depth of a rich vegetable broth, all topped with toasted baguette slices and melted Gruyère cheese. This heartwarming soup is a favorite in French cuisine and is perfect for chilly days or when you’re in need of some culinary indulgence. The Gruyère croutons add a delightful cheesy crunch to every spoonful, making this soup a true delight for the senses.

Cooking Time:

  • Prep Time: 15 minutes
  • Cook Time: 1 hour 15 minutes
  • Total Time: 1 hour 30 minutes
  • Servings: 4


  • 4 large onions, thinly sliced
  • 3 tablespoons unsalted butter
  • 2 tablespoons olive oil
  • 1 teaspoon granulated sugar
  • 4 cups vegetable broth
  • 1/2 cup dry white wine (optional)
  • 2 cloves garlic, minced
  • 1 bay leaf
  • Salt and pepper to taste
  • 1 baguette, sliced into rounds
  • 2 cups shredded Gruyère cheese
  • Fresh thyme leaves for garnish


  1. Caramelize the Onions:
    • In a large, heavy-bottomed pot, melt the butter and olive oil over medium heat.
    • Add the thinly sliced onions and cook for about 15 minutes, stirring occasionally, until they become soft and start to turn golden brown.
    • Sprinkle sugar over the onions and continue to cook, stirring occasionally, for another 30-40 minutes until the onions are deeply caramelized and have turned a rich brown color.
  2. Prepare the Broth:
    • Pour in the vegetable broth and white wine (if using) into the pot with the caramelized onions.
    • Add minced garlic, bay leaf, and a pinch of salt and pepper to the pot. Stir to combine.
    • Bring the soup to a gentle simmer and let it cook for about 20-30 minutes to allow the flavors to meld together.
  3. Toast the Baguette Slices:
    • While the soup simmers, preheat your oven’s broiler.
    • Place the baguette slices on a baking sheet and toast them under the broiler for 1-2 minutes on each side, until they’re lightly golden.
  4. Prepare the Gruyère Croutons:
    • Sprinkle a generous amount of shredded Gruyère cheese over each toasted baguette slice.
    • Place the cheese-topped slices back under the broiler for an additional 1-2 minutes, until the cheese is melted and bubbly.
  5. Assemble and Serve:
    • Remove the bay leaf from the soup and season with additional salt and pepper if needed.
    • Ladle the hot soup into oven-safe bowls.
    • Float a couple of Gruyère croutons on top of each bowl of soup.
    • For the finishing touch, garnish with fresh thyme leaves.


  • Caramelizing Onions: Take your time caramelizing the onions over medium-low heat. This slow process allows them to develop their rich, sweet flavor.
  • Choosing Onions: Yellow or sweet onions are typically used for French onion soup due to their mild and sweet taste.
  • Wine: While wine is optional, it adds depth to the broth. Choose a dry white wine like Chardonnay or Sauvignon Blanc.
  • Gruyère Cheese: Gruyère cheese is a key component of this soup. Its nutty and slightly sweet flavor complements the onions perfectly.
  • Oven-Safe Bowls: Make sure the bowls you use for serving are oven-safe if you plan to melt the cheese directly on the soup.

Enjoy this comforting and indulgent French Onion Soup with Gruyère Croutons as a starter or a light meal. Its combination of flavors and textures will surely satisfy your taste buds and warm your soul.

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