Best French Onion Soup

French onion soup is a timeless classic that offers the perfect combination of rich, savory flavors and satisfying textures. Known for its caramelized onions, rich broth, and gooey, melted cheese topping, this comforting dish is perfect for chilly evenings or when you’re craving something cozy. In this article, we will guide you through the steps to prepare the best French onion soup, ensuring it’s bursting with flavor and textures that will leave you coming back for more.

Ingredients:

  • 4 large yellow onions (thinly sliced)
  • 4 tablespoons butter
  • 2 tablespoons olive oil
  • 2 cloves garlic (minced)
  • 1 teaspoon salt
  • 1/2 teaspoon sugar (to help caramelize the onions)
  • 6 cups beef broth (or vegetable broth for a lighter option)
  • 1/2 cup dry white wine (optional, but adds depth)
  • 2 teaspoons fresh thyme (or 1 teaspoon dried thyme)
  • 1 bay leaf
  • Freshly ground black pepper (to taste)
  • 4-6 slices of French baguette
  • 1 1/2 cups shredded Gruyère cheese (or Swiss cheese)
  • 1/2 cup shredded Parmesan cheese (for extra richness)

Instructions:

Step 1: Caramelize the Onions

  1. Heat a large pot or Dutch oven over medium heat and add the butter and olive oil.
  2. Add the sliced onions and cook, stirring occasionally, until they become soft and golden brown. This will take about 35-45 minutes. Patience is key – slow caramelization is what gives the soup its sweet, deep flavor.
  3. Once the onions are fully caramelized, add the minced garlic and cook for an additional 2 minutes until fragrant.

Step 2: Add the Broth and Seasonings

  1. Sprinkle the onions with salt and sugar to enhance their natural sweetness.
  2. Pour in the wine (if using) and scrape up any browned bits from the bottom of the pot.
  3. Add the beef broth, thyme, bay leaf, and black pepper. Stir everything together, then bring the soup to a boil. Lower the heat and let it simmer for about 30 minutes, allowing the flavors to meld together.

Step 3: Prepare the Toasted Bread

  1. While the soup is simmering, preheat your oven to 400°F (200°C).
  2. Place the baguette slices on a baking sheet and toast them in the oven for 5-7 minutes until golden brown and crisp.

Step 4: Assemble and Broil

  1. Remove the bay leaf from the soup and ladle the hot soup into oven-safe bowls.
  2. Place a slice of toasted baguette on top of each bowl of soup.
  3. Generously sprinkle the Gruyère and Parmesan cheeses on top of the bread.
  4. Place the bowls under the broiler for 3-5 minutes, or until the cheese is melted, bubbly, and golden brown.

Step 5: Serve and Enjoy

Carefully remove the bowls from the oven, let them cool slightly, and serve your homemade French onion soup hot. The combination of the rich, flavorful broth, the sweetness of the caramelized onions, and the melty cheese on top is sure to impress.

Tips for the Best French Onion Soup:

  • Patience is key: The onions must be caramelized slowly to bring out their sweetness. Don’t rush this step.
  • Broth quality: A good, rich broth is essential. If you can, opt for homemade beef broth for the deepest flavor.
  • Cheese choice: Gruyère cheese is the traditional choice, but you can also mix it with Swiss or even add a bit of mozzarella for a different texture.
  • Customize it: Some variations of French onion soup include a splash of brandy or sherry to add depth. Feel free to experiment with flavors that suit your taste!

Why You’ll Love This French Onion Soup Recipe

  • Rich, savory flavor: The caramelized onions and hearty beef broth create a rich, deep flavor profile.
  • Perfect comfort food: With gooey cheese, toasted bread, and hot soup, this dish is the ultimate cozy meal.
  • Crowd-pleaser: This recipe is perfect for serving to guests. It’s elegant enough for a dinner party but easy enough to prepare for a casual weeknight meal.

Final Thoughts

The best French onion soup recipe combines the right balance of sweet, savory, and rich flavors. It’s a dish that’s sure to warm you up, whether you’re serving it on a cold winter day or enjoying a comforting bowl with friends. With this simple recipe, you’ll create a truly delicious version of this French classic that’s bound to become a household favorite.

Enjoy this homemade French onion soup recipe with a side salad or as a starter for your next dinner party. Bon appétit!

Serving and Storage Tips for the Best French Onion Soup

Serving Tips:

  1. Garnish with Fresh Herbs: For an added touch of flavor and color, consider garnishing the soup with fresh thyme or parsley just before serving. This will enhance the aroma and add a vibrant contrast to the rich, golden tones of the soup.
  2. Pair with Wine: French onion soup pairs beautifully with a glass of dry white wine, such as Sauvignon Blanc, or a light red wine like Pinot Noir. The acidity in the wine complements the savory, caramelized flavors of the soup.
  3. Serve as a Starter or Main Dish: French onion soup can be served as a starter to a hearty meal or as a main course. If serving as a main, consider adding a side salad with a tangy vinaigrette to balance out the richness of the soup.
  4. Serve with Extra Toasted Bread: For a complete meal, serve extra slices of toasted baguette on the side. These can be enjoyed with the soup or used to scoop up any leftover broth.

Storage Tips:

  1. Refrigeration:
    • Store any leftover French onion soup in an airtight container in the refrigerator for up to 3-4 days. The flavors will continue to meld together, making it even tastier the next day!
  2. Freezing:
    • French onion soup can be frozen, though it’s best to freeze the soup without the bread and cheese. The bread may become soggy when reheated, and the cheese may separate or change texture.
    • To freeze, allow the soup to cool completely, then transfer it into a freezer-safe container. It will keep for up to 3 months.
    • When ready to serve, reheat the soup on the stove and add freshly toasted bread and melted cheese before serving.
  3. Reheating:
    • To reheat, warm the soup on the stove over medium heat, stirring occasionally until hot. If you have frozen the soup, defrost it in the fridge overnight before reheating.
    • Add the cheese and toasted bread just before serving, either under the broiler or in the oven for a crispy, bubbly topping.

With these serving and storage tips, you can enjoy your French onion soup for days to come while ensuring it stays as delicious as when it was first made!

1. Can I use a different type of cheese for French onion soup?
Yes, you can substitute Gruyère with other cheeses if you prefer. Swiss cheese is a common alternative, and some people like to mix in mozzarella for extra gooeyness. Parmesan is also a great addition for a slightly sharper flavor. Just make sure to choose a cheese that melts well!

2. Can I make French onion soup ahead of time?
Absolutely! French onion soup can be made in advance. Prepare the soup up to the point of adding the cheese and bread topping. Let it cool and store it in an airtight container in the refrigerator for up to 3-4 days. When you’re ready to serve, reheat the soup, add the toasted bread, and melt the cheese under the broiler.

3. Can I make French onion soup vegetarian?
Yes, you can easily make French onion soup vegetarian by swapping the beef broth for vegetable broth. The soup will still be rich and flavorful thanks to the caramelized onions and seasonings. You can also use a vegetarian-friendly cheese like aged cheddar if desired.

4. How do I store leftovers of French onion soup?
To store leftovers, let the soup cool completely before transferring it to an airtight container. It can be refrigerated for up to 3-4 days. If you’d like to freeze it, avoid freezing the bread and cheese. Store the soup without these toppings in a freezer-safe container for up to 3 months, then add fresh bread and cheese when reheating.

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Best French Onion Soup

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This classic French onion soup is rich, savory, and comforting. Slow-cooked caramelized onions are simmered in a flavorful beef broth, then topped with crusty bread and melted Gruyère cheese for the ultimate comfort food experience. Perfect as a starter or a hearty meal on a chilly evening.

  • Author: Stephanie
  • Prep Time: 15 minutes
  • Cook Time: 1 hour
  • Total Time: 1 hour 15 minutes
  • Yield: 4 servings 1x
  • Category: Soup
  • Method: Simmering
  • Cuisine: French

Ingredients

Scale
  • 6 large yellow onions, thinly sliced
  • 4 tbsp unsalted butter
  • 2 tbsp olive oil
  • 1 tsp sugar
  • 2 cloves garlic, minced
  • 1/2 cup dry white wine (optional)
  • 8 cups beef stock (or vegetable stock for vegetarian version)
  • 2 sprigs fresh thyme
  • 1 bay leaf
  • Salt and black pepper, to taste
  • 1 baguette, sliced into 1-inch rounds
  • 2 cups Gruyère cheese, shredded

Instructions

  1. Caramelize the Onions:
    In a large pot or Dutch oven, melt butter with olive oil over medium heat. Add the sliced onions and stir to coat. Sprinkle with sugar and cook, stirring occasionally, until onions are golden and caramelized, about 30-40 minutes. Adjust the heat as needed to prevent burning.
  2. Add Garlic and Wine:
    Stir in minced garlic and cook for 1 minute until fragrant. Deglaze the pan with white wine, scraping up any browned bits, and simmer for 2-3 minutes until the wine reduces slightly.
  3. Simmer the Soup:
    Add the beef stock, thyme sprigs, and bay leaf. Bring to a boil, then reduce the heat and simmer for 20-30 minutes. Remove thyme sprigs and bay leaf. Season with salt and pepper to taste.
  4. Prepare the Topping:
    Preheat the broiler. Arrange baguette slices on a baking sheet and toast under the broiler until lightly golden, about 1-2 minutes per side.
  5. Assemble and Broil:
    Ladle the soup into oven-safe bowls. Place a toasted baguette slice on top of each bowl and sprinkle generously with shredded Gruyère cheese. Place the bowls under the broiler until the cheese is bubbly and golden, about 2-4 minutes.
  6. Serve Hot:
    Carefully remove the bowls from the oven and serve immediately. Enjoy your delicious French onion soup!

Notes

  • For a vegetarian option, use vegetable stock and skip the Gruyère cheese or replace it with a plant-based alternative.
  • To deepen the flavor, use a mix of yellow and sweet onions.
  • If you don’t have Gruyère, Swiss cheese or mozzarella work well too.

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