French Onion Soup is a rich, savory soup that’s perfect for cold days or a comforting meal. This traditional dish is made by slow-cooking onions until they are golden brown and caramelized, then simmering them with a flavorful broth. It’s topped with toasted bread and melted cheese, creating a deliciously warm and hearty soup that’s sure to satisfy. Whether you’re serving it as a starter or as a main course, French Onion Soup is a dish that never goes out of style.
Why You’ll Love This Recipe
French Onion Soup is the ultimate comfort food. The deep, caramelized flavors of the onions meld perfectly with the rich broth, creating a flavorful base that’s both sweet and savory. The gooey cheese on top adds a melty, indulgent touch that brings the whole dish together. Plus, it’s incredibly easy to make, yet impressive enough to serve for special occasions. With a combination of ingredients that are easy to find and the ability to make it ahead of time, this soup is a keeper.
Ingredients
- 4 large yellow onions, thinly sliced
- 2 tablespoons butter
- 1 tablespoon olive oil
- 1 teaspoon sugar (optional, to enhance caramelization)
- 4 cups beef broth
- 1 cup dry white wine
- 2 tablespoons flour
- 2 sprigs thyme
- 1 bay leaf
- Salt and pepper, to taste
- 1 baguette, sliced into 1-inch thick slices
- 2 cups grated Gruyère cheese
- 1 cup grated Parmesan cheese
Step-by-Step Instructions
- Caramelize the Onions: In a large pot, warm the butter and olive oil over medium heat. Add the chopped onions and a small amount of salt. Cook for about 30-40 minutes, stirring occasionally, until the onions are golden brown and caramelized. If you prefer a deeper flavor, add a teaspoon of sugar to the onions to enhance the caramelization.
- Prepare the Soup Base: Once the onions are caramelized, sprinkle the flour over the onions and stir to coat. This will help thicken the soup. Cook for another 2 minutes, then pour in the wine and scrape up any brown bits from the bottom of the pot.
- Simmer the Soup: Add the beef broth, thyme, and bay leaf to the pot. Bring to a boil, then reduce the heat and let the soup simmer uncovered for about 20 minutes. Season with salt and pepper to taste.
- Toast the Bread: While the soup simmers, preheat the oven to 400°F (200°C). Arrange the sliced baguette on a baking sheet and toast in the oven for 5-7 minutes or until golden and crispy.
- Assemble the Soup: Spoon the soup into bowls that are safe for oven use. Place the toasted baguette slices on top of the soup, then sprinkle with Gruyère and Parmesan cheese.
- Broil the Soup: Set the bowls under the broiler for 2-3 minutes, or until the cheese has melted and is bubbly. Watch closely to prevent burning.
- Serve: Carefully remove the bowls from the oven and serve hot.
Serving Suggestions
French Onion Soup is perfect on its own or paired with a light salad or roasted vegetables. It’s a great starter for a French-themed meal, but it can also be served as a satisfying main course. Pair it with a glass of dry white wine, such as Chardonnay, to complement the flavors of the soup.
Variations
- Vegetarian Version: Use vegetable broth instead of beef broth for a vegetarian-friendly soup.
- Extra Flavor: For an extra layer of flavor, add a splash of sherry or brandy along with the wine.
- Cheese Variations: While Gruyère is the classic choice, you can also use Swiss cheese, fontina, or a blend of your favorites.
Storage
French Onion Soup can be stored in an airtight container in the fridge for up to 3 days. Reheat it gently on the stovetop. You can also store the soup base and toppings separately, then assemble and broil the soup when you’re ready to serve.
FAQ
- Can French Onion Soup be prepared beforehand? Yes, it can be made beforehand. Just store the soup base in the fridge and assemble it with the toasted bread and cheese right before serving.
- Can I freeze French Onion Soup?
Yes, the soup base can be frozen for up to 3 months. Allow it to cool completely before transferring to a container suitable for freezing. When you’re ready to serve, thaw it in the refrigerator overnight and reheat it on the stove. Toast the bread and add cheese when ready to serve. - Can I use onions other than yellow onions?
Yellow onions are the most commonly used for French Onion Soup, but you can also use white or sweet onions for a milder taste. The key is to caramelize them properly for the best flavor.
