Soup made with onions and typically served with melted cheese on top.

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French Onion Soup is a timeless comfort food, perfect for cozy nights and gatherings with loved ones. The sweet, caramelized onions blend with a rich, flavorful broth, and are crowned with a golden, melty layer of cheese. One of the most essential elements for creating a bowl of truly satisfying French Onion Soup is choosing the right stock.

A great stock can elevate the flavor, while a subpar one may leave the soup lacking depth. Opting for a high-quality beef broth or a combination of beef and chicken stock creates the ideal base. If you’re looking to enhance the flavor further, a spoonful of beef broth, such as ‘Better Than Bouillon,’ can make a world of difference. This recipe will guide you through the steps to make a rich, velvety French Onion Soup that is perfectly balanced with savory, sweet, and cheesy notes.

Ingredients:

  • 6 large red or yellow onions (approximately 3 pounds)
  • 4 tablespoons of high-quality olive oil
  • 2 tablespoons of unsalted butter
  • 1 teaspoon of sugar
  • Salt to taste
  • 2 cloves of garlic, finely chopped
  • 8 cups of broth (beef, chicken, or a combination of both)
  • 1/2 cup of dry vermouth or white wine
  • 2 bay leaves
  • 1 tablespoon of fresh thyme leaves (or 1/2 teaspoon dried thyme)
  • 1/2 teaspoon of freshly ground black pepper
  • 2 tablespoons of brandy (optional, but adds depth)
  • 8 slices of French bread or baguette, 1-inch thick
  • 1 1/2 cups of shredded Gruyère cheese
  • Shredded Parmesan cheese for garnish

Directions:

Step 1: Preparing the Onions

Start by peeling off the outer layers of the onions and slicing them thinly. Aim for about 10 cups of sliced onions, as this will ensure a rich, flavorful base for your soup. The key to a good French Onion Soup lies in how well you caramelize the onions, so don’t rush this process.

Step 2: Caramelizing the Onions

In a large, heavy-bottomed pot, heat 3 tablespoons of olive oil over medium heat. Add the sliced onions and stir to coat them evenly in the oil. Cook the onions for about 15-20 minutes, stirring occasionally to ensure they soften evenly. During this time, they will release their natural sweetness, a key component of the soup’s flavor.

Step 3: Achieving the Perfect Golden Color

Once the onions have softened, increase the heat to medium-high. Add the remaining 1 tablespoon of olive oil and 2 tablespoons of butter to the pot. Stir continuously as the onions begin to brown. This process can take anywhere from 20 to 40 minutes, depending on the size of your pot and the type of onions you’re using. Patience is key, as the caramelization develops the deep, sweet flavor that makes this soup so irresistible.

Step 4: Enhancing the Flavor with Sugar and Garlic

To speed up the caramelization process, sprinkle 1 teaspoon of sugar and a pinch of salt over the onions. This will help the onions brown faster while intensifying their sweetness. Continue cooking for an additional 10-15 minutes, allowing the onions to turn a rich, dark brown color. Once they have reached this stage, add the chopped garlic and cook for another minute until fragrant.

Step 5: Deglazing the Pot and Building Flavor

To unlock all the delicious browned bits stuck to the bottom of the pot, pour in the dry vermouth or white wine. Use a wooden spoon to scrape up these flavorful remnants. Allow the wine to cook down for a few minutes until it’s mostly reduced. This deglazing step helps concentrate the flavors and adds another layer of richness to the soup.

Step 6: Simmering the Soup

Now, add the broth (beef, chicken, or a mix), bay leaves, thyme, and black pepper. Stir everything together, then bring the mixture to a simmer. Cover the pot and reduce the heat, allowing the soup to gently cook for about 30 minutes. This slow simmer allows all the flavors to meld together beautifully. Before serving, taste the soup and adjust the salt and pepper to your preference. If you’d like to add an extra depth of flavor, feel free to stir in 2 tablespoons of brandy at this point.

Step 7: Toasting the Bread and Melting the Cheese

While your soup simmers, preheat the oven to 450°F. Line a baking sheet with parchment paper or foil, then lay out the French bread slices on the sheet. Brush each slice with olive oil on both sides and toast in the oven for about 5-7 minutes until golden brown. Flip the bread slices over, then top each slice with a generous portion of shredded Gruyère and a sprinkle of Parmesan cheese. Return the bread to the oven and bake until the cheese is melted and slightly browned, about 5 minutes more.

Step 8: Serving the Soup

To serve, ladle the hot soup into bowls, placing a slice of cheesy bread on top. For an extra indulgent touch, if your bowls are oven-safe, you can bake the soup with the cheese on top. Simply place the bowls in a preheated oven at 350°F for about 10 minutes, or until the cheese is melted and bubbling.

Conclusion:

French Onion Soup is a comforting and rich dish that’s perfect for any occasion, whether it’s a cozy dinner at home or a festive gathering. By choosing high-quality ingredients like premium stock and Gruyère cheese, and taking the time to caramelize the onions slowly, you’ll create a soup that’s full of depth and warmth. The combination of tender, flavorful onions, savory broth, and a golden layer of melted cheese makes this dish truly irresistible.

Whether served with a side salad or enjoyed as a hearty meal on its own, this French Onion Soup is sure to become a favorite in your kitchen. The perfect balance of sweet onions, savory broth, and cheesy toast will leave everyone reaching for seconds.