Classic French Onion Soup
Introduction
French onion soup is a classic dish that has been enjoyed for centuries, known for its rich flavor and comforting qualities. This timeless recipe involves caramelized onions, savory beef broth, and a topping of melted cheese over crusty bread. It’s the perfect dish for a chilly evening or when you need a taste of warm nostalgia.
Detailed Ingredients with measures
– Onions: 4 large yellow onions, thinly sliced
– Olive oil: 2 tablespoons
– Butter: 2 tablespoons
– Salt: 1 teaspoon
– Sugar: 1 teaspoon
– Garlic: 2 cloves, minced
– Beef broth: 8 cups
– Dry white wine: 1 cup
– Fresh thyme: 2-3 sprigs
– Bay leaf: 1
– Baguette: 1, sliced
– Gruyère cheese: 1 ½ cups, shredded
– Parmesan cheese: ½ cup, grated
Prep Time
Preparation time for this classic French onion soup is approximately 15 minutes. This includes the time needed to slice onions and prepare all other ingredients for cooking.
Cook Time, Total Time, Yield
The cook time is about 45 minutes to 1 hour, as it involves caramelizing the onions and simmering the broth. Therefore, the total time from prep to serving will be around 1 hour and 15 minutes. This recipe yields about 4 to 6 servings, making it a great option for family dinners or gatherings.

Detailed Directions and Instructions
Step 1: Prepare Ingredients
Start by gathering all your ingredients. Ensure that you have onions, butter, olive oil, broth, wine, thyme, bay leaves, cheese, and bread ready for use.
Step 2: Caramelize the Onions
In a large pot or Dutch oven, melt butter and add olive oil over medium heat. Add the sliced onions, stirring them to coat. Cook the onions slowly for about 30-40 minutes until they become deeply caramelized, stirring occasionally to avoid burning.
Step 3: Add Broth and Flavorings
Once the onions are caramelized, add the wine to deglaze the pot, scraping up any browned bits from the bottom. After the wine has evaporated, pour in the broth, and add thyme and bay leaves.
Step 4: Simmer the Soup
Allow the mixture to come to a gentle simmer. Reduce the heat and let it simmer for at least 30 minutes to develop the flavors. Adjust seasoning with salt and pepper to taste.
Step 5: Prepare the Topping
While the soup simmers, slice the bread and toast it until golden brown. Prepare the cheese by shredding or slicing it for topping.
Step 6: Assemble the Soup
Once the soup is ready, ladle it into oven-safe bowls. Place a piece of toasted bread on top of each bowl followed by a generous amount of cheese.
Step 7: Broil the Soup
Preheat the broiler. Place the assembled soup bowls on a baking sheet and broil them for 2-5 minutes, or until the cheese is bubbly and golden brown. Watch closely to avoid burning.
Step 8: Serve Immediately
Remove the soup from the oven and let it cool slightly before serving. Enjoy your classic French onion soup hot.
Notes
Tip for Onions
Use yellow onions for the best flavor. Sweet onions can also work, but they may result in a sweeter soup.
Consistency Preference
If you prefer a thicker soup, consider adding a bit more cheese to the top before broiling.
Storage Suggestions
Leftovers can be stored in the refrigerator for up to 3 days. Reheat gently on the stove before serving.
Vegetarian Option
For a vegetarian version, ensure that you use vegetable broth in place of beef or chicken broth.

Cook techniques
Caramelizing Onions
The key to a rich and flavorful French onion soup is the slow caramelization of the onions. This process transforms the natural sugars in the onions, creating a sweet and savory flavor profile.
Deglazing
After the onions have caramelized, deglazing the pan with broth helps to lift and incorporate the fond (the brown bits) from the bottom of the pan, adding depth to the soup.
Simmering
Allowing the soup to simmer after adding the broth enhances the flavors as they meld together. This step is crucial for achieving a well-balanced taste.
Toast the Bread
To make the perfect topping for the soup, toasting the bread adds a crunchy texture. This step also prevents the bread from becoming too soggy when layered on top of the soup.
Broiling
Finishing the soup under the broiler allows the cheese to melt and develop a golden, bubbly crust, which is quintessential for a classic French onion soup.
FAQ
Can I use different types of onions?
Yes, you can use different types of onions, such as yellow, white, or even sweet onions, each imparting a unique flavor to the soup.
How long does it take to caramelize onions?
Caramelizing onions typically takes 30 to 45 minutes over low to medium heat, depending on the quantity and the desired level of sweetness.
Can I make this soup ahead of time?
Absolutely! French onion soup can be made ahead and stored in the refrigerator. Reheat before serving, and add the toasted bread and cheese just before broiling.
Is there a vegetarian option for this soup?
Yes, you can use vegetable broth instead of beef broth for a vegetarian version of French onion soup.
What type of cheese is best for topping?
Traditionally, Gruyère cheese is used for topping French onion soup, but you can also use Swiss, fontina, or a blend of your favorite cheeses.

Conclusion
Classic French onion soup is a delightful dish that combines the rich flavors of caramelized onions, savory broth, and melted cheese, creating a comforting and satisfying experience. Its warmth and depth make it perfect for any occasion, whether as an appetizer or a main course. With a few simple ingredients, you can recreate this classic in your kitchen and enjoy a taste of France at home.
Pair with a Fresh Salad
Enhance your soup experience by serving it alongside a crisp, refreshing salad. A simple green salad with a light vinaigrette can balance the richness of the soup.
Grilled Cheese Sandwich
For a hearty meal, consider pairing your French onion soup with a classic grilled cheese sandwich. The melty cheese complements the flavors of the soup wonderfully.
Roasted Vegetables
Roasted seasonal vegetables can make a perfect side dish, adding a variety of flavors and textures to your meal. Consider using root vegetables or Brussels sprouts for a delightful combination.
Crusty Bread Basket
Serve the soup with a basket of crusty bread for dipping. A variety of artisan breads can elevate your dining experience.
Wine Pairing
Choose a glass of white wine, such as Sauvignon Blanc or Chardonnay, to pair with your soup. The acidity and fruitiness of these wines can enhance the flavors of the dish.