Indulge in the rich and comforting flavors of French onion soup, a classic dish that combines caramelized onions, savory beef broth, and melted gruyere cheese. This recipe is perfect for a cozy night in or as a starter for a special meal. The slow-cooked onions bring out a deep sweetness that pairs beautifully with the robust broth and the cheesy, toasted bread topping.
While most of the ingredients for this French onion soup are common pantry staples, you might need to make a special trip to the supermarket for gruyere cheese. This Swiss cheese is known for its creamy texture and nutty flavor, which is essential for achieving the perfect cheesy crust on top of the soup. Additionally, make sure to pick up a good quality beef broth and a dry white wine to enhance the depth of flavors in the soup.

Ingredients For French Onion Soup Recipe
Onions: The star of the dish, these are thinly sliced and caramelized to bring out their natural sweetness.
Beef broth: Provides a rich, savory base for the soup.
White wine: Used to deglaze the pot and add a layer of complexity to the flavor.
Butter: Helps to caramelize the onions and adds a rich, creamy texture.
Sugar: Enhances the sweetness of the caramelized onions.
Salt: Balances the flavors and enhances the overall taste.
Black pepper: Adds a hint of spice and depth to the soup.
French bread: Toasted slices are used as a base for the melted cheese topping.
Gruyere cheese: Grated and melted on top of the soup, providing a creamy, nutty finish.
Technique Tip for This Recipe
When caramelizing onions, patience is key. Cook them slowly over medium heat, stirring occasionally, to achieve a deep, rich color and flavor. Rushing this step can result in unevenly cooked onions and a less flavorful soup.
Suggested Side Dishes
Alternative Ingredients
4 large thinly sliced onions - Substitute with 3 large shallots: Shallots have a milder and sweeter flavor, which can add a different depth to the soup.
4 cups beef broth - Substitute with 4 cups vegetable broth: Vegetable broth is a good alternative for vegetarians and can still provide a rich flavor.
½ cup white wine - Substitute with ½ cup apple cider: Apple cider adds a slight sweetness and acidity similar to white wine.
2 tablespoon butter - Substitute with 2 tablespoon olive oil: Olive oil is a healthier fat option and can provide a different but pleasant flavor.
1 teaspoon sugar - Substitute with 1 teaspoon honey: Honey adds a natural sweetness and a slight floral note.
1 teaspoon salt - Substitute with 1 teaspoon soy sauce: Soy sauce adds saltiness along with umami flavor.
¼ teaspoon black pepper - Substitute with ¼ teaspoon white pepper: White pepper has a milder flavor and can be less visually noticeable in the soup.
4 slices toasted french bread - Substitute with 4 slices toasted sourdough bread: Sourdough has a tangy flavor that can complement the sweetness of the onions.
1 cup grated gruyere cheese - Substitute with 1 cup grated mozzarella cheese: Mozzarella melts well and has a mild flavor that can work as a substitute.
Other Alternative Recipes
How to Store / Freeze This Dish
Allow the French onion soup to cool to room temperature before storing. This prevents condensation and helps maintain the soup's flavor and texture.
Transfer the cooled soup into airtight containers. For portion control, consider using individual serving-sized containers. This makes reheating easier and reduces waste.
If you plan to enjoy the soup within the next few days, store the containers in the refrigerator. The soup will stay fresh for up to 4 days.
For longer storage, freeze the soup. Ensure there's some space at the top of the container to allow for expansion as the soup freezes.
When freezing, label each container with the date. This helps you keep track of how long the soup has been stored.
To reheat refrigerated soup, pour it into a pot and warm it over medium heat until it reaches your desired temperature. Stir occasionally to ensure even heating.
For frozen soup, thaw it in the refrigerator overnight. Once thawed, reheat it in a pot over medium heat, stirring occasionally.
If you prefer to reheat the soup directly from frozen, place it in a pot with a splash of beef broth or water. Heat over low to medium heat, stirring frequently until fully thawed and warmed through.
When reheating, you can refresh the soup by adding a bit more white wine or beef broth to enhance the flavors.
If you have leftover toasted French bread and gruyere cheese, store them separately. The bread can be kept in an airtight container at room temperature for up to 2 days, while the cheese should be refrigerated.
To serve, reheat the soup as described, then ladle it into oven-safe bowls. Top with a slice of the stored toasted French bread and a generous sprinkle of grated gruyere cheese.
Place the bowls on a baking sheet and bake in a preheated oven at 350°F (175°C) until the cheese is melted and bubbly, about 10 minutes. Enjoy your deliciously reheated French onion soup!
How to Reheat Leftovers
Gently reheat the French onion soup on the stovetop over medium-low heat. Stir occasionally to ensure even heating and prevent the onions from sticking to the bottom of the pot. This method preserves the rich flavors and textures of the soup.
For a quick fix, use the microwave. Transfer the soup to a microwave-safe bowl, cover it with a microwave-safe lid or plate, and heat on medium power in 1-minute intervals. Stir between intervals until the soup is heated through. This method is convenient but may slightly alter the texture of the gruyere cheese.
If you have leftover toasted French bread and gruyere cheese, reassemble the soup as you would when initially serving. Ladle the reheated soup into oven-safe bowls, top with the bread and cheese, and broil in the oven until the cheese is bubbly and golden. This method recreates the delightful, melty topping that makes French onion soup so special.
For an extra touch of freshness, add a splash of white wine or a sprinkle of fresh herbs like thyme or parsley just before serving. This can revive the flavors and add a new dimension to the reheated soup.
Best Tools for This Recipe
Large pot: Used to melt butter and cook the onions until caramelized.
Wooden spoon: Ideal for stirring the onions and ensuring they cook evenly without burning.
Measuring cups: Necessary for accurately measuring the beef broth and white wine.
Measuring spoons: Used to measure the sugar, salt, and black pepper.
Oven-safe bowls: Essential for ladling the soup into and baking with the toasted bread and cheese on top.
Baking sheet: Placed under the oven-safe bowls to catch any drips while baking.
Cheese grater: Used to grate the Gruyere cheese.
Knife: For thinly slicing the onions.
Cutting board: Provides a safe surface for slicing the onions.
Toaster: Used to toast the French bread slices.
Oven: Preheated to 350°F (175°C) for baking the soup with the bread and cheese.
Ladle: For serving the soup into the oven-safe bowls.
How to Save Time on This Recipe
Pre-caramelize onions: Caramelize a large batch of onions in advance and freeze portions. Thaw and use as needed.
Use store-bought broth: Opt for high-quality beef broth from the store to save time on making your own.
Pre-toast bread: Toast French bread slices ahead of time and store them in an airtight container.
Shred cheese in bulk: Grate a large amount of Gruyere cheese and store it in the fridge for quick use.
Simmer in a slow cooker: Use a slow cooker to simmer the soup while you attend to other tasks.

French Onion Soup Recipe
Ingredients
Main Ingredients
- 4 large onions thinly sliced
- 4 cups beef broth
- ½ cup white wine
- 2 tablespoon butter
- 1 teaspoon sugar
- 1 teaspoon salt
- ¼ teaspoon black pepper
- 4 slices French bread toasted
- 1 cup Gruyere cheese grated
Instructions
- Melt butter in a large pot over medium heat. Add onions and cook until caramelized, about 25 minutes.
- Add sugar and salt, cook for another 5 minutes.
- Pour in white wine to deglaze the pot, then add beef broth. Bring to a boil, then reduce heat and simmer for 30 minutes.
- Preheat the oven to 350°F (175°C). Ladle soup into oven-safe bowls, top each with a slice of toasted French bread and grated Gruyere cheese.
- Place bowls on a baking sheet and bake until cheese is melted and bubbly, about 10 minutes.
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