Classic French Onion Soup
Classic French Onion Soup is a medium French recipe that serves 4. 350 calories per serving. Recipe by Allrecipes on YouTube.
Prep: 15 min | Cook: 1 hr 13 min | Total: 1 hr 43 min
Cost: $12.30 total, $3.08 per serving
Ingredients
- 4 large Yellow Onion (thinly sliced)
- 2 tablespoons Unsalted Butter (cut into pieces)
- 1 tablespoon Olive Oil (extra‑virgin preferred)
- 2 teaspoons Fresh Thyme (leaves stripped from stems)
- ½ cup Dry Sherry (use a good quality dry sherry)
- 4 cups Beef Broth (low‑sodium, preferably homemade)
- 1 teaspoon Salt (or to taste)
- ½ teaspoon Black Pepper (freshly ground)
- ½ baguette Baguette (French Bread) (cut into 1‑inch slices)
- 1 cup Gruyère Cheese (shredded)
- ½ cup Provolone Cheese (shredded)
- ½ cup Swiss Cheese (shredded)
- ¼ cup Parmesan Cheese (freshly grated)
Instructions
Slice the onions
Trim the ends of the yellow onions, halve them, and slice into thin, uniform half‑moon strips. No mandolin needed; a sharp chef’s knife works fine.
Time: PT5M
Melt butter and olive oil
Place the pot over medium‑low heat, add 2 Tbsp butter and 1 Tbsp olive oil. Stir until the butter is fully melted and the mixture is shimmering.
Time: PT2M
Temperature: Medium‑low
Caramelize the onions
Add the sliced onions to the pot, stirring to coat with the butter‑oil mixture. Cook over medium‑low heat, stirring every few minutes, until the onions turn a deep golden‑brown and have reduced in volume. This takes about 40 minutes.
Time: PT40M
Temperature: Medium‑low
Add fresh thyme
Stir in 2 tsp fresh thyme leaves (or 1 tsp dried thyme) and cook for another minute to release aroma.
Time: PT1M
Deglaze with sherry
Pour in ½ cup dry sherry, scraping the browned bits from the bottom of the pot. Let the alcohol evaporate for about 2 minutes.
Time: PT2M
Add broth and simmer
Add 4 cups beef broth, season with 1 tsp salt and ½ tsp black pepper. Bring to a gentle simmer, then reduce heat and let simmer uncovered for 30 minutes to meld flavors.
Time: PT30M
Temperature: Simmer
Prepare the cheese‑topped bread
While the soup simmers, preheat the broiler. Slice the baguette into 1‑inch pieces (about 8 slices). Arrange slices on a rimmed baking sheet. Mix the shredded Gruyère, provolone, Swiss, and grated Parmesan together, then sprinkle an even layer over each bread slice.
Time: PT5M
Broil the cheese‑topped croutons
Place the baking sheet under the preheated broiler. Broil for 2‑3 minutes, watching closely, until the cheese is melted, bubbly, and lightly browned.
Time: PT3M
Temperature: Broiler (high)
Serve
Ladle hot soup into bowls, float one or two cheese‑topped croutons on each, garnish with a pinch of fresh thyme leaves and cracked black pepper. Enjoy immediately.
Time: PT2M
Nutrition Facts
- Calories
- 350
- Protein
- 12 g
- Carbohydrates
- 30 g
- Fat
- 18 g
- Fiber
- 3 g
Dietary info: Contains meat, Contains dairy, Contains gluten
Allergens: Dairy, Gluten
Ingredient Substitutions
- Instead of Yellow Onion: Sweet onion, Vidalia onion
- Instead of Unsalted Butter: Margarine, Ghee
- Instead of Olive Oil: Canola oil, vegetable oil
- Instead of Fresh Thyme: Dried thyme (1 tsp)
- Instead of Dry Sherry: Dry white wine, Marsala
- Instead of Beef Broth: Chicken broth, Vegetable broth (non‑vegetarian version)
- Instead of Salt: Sea salt, Kosher salt
- Instead of Black Pepper: White pepper
- Instead of Baguette (French Bread): Italian ciabatta, sourdough
- Instead of Gruyère Cheese: Emmental, Swiss cheese
- Instead of Provolone Cheese: Mozzarella
- Instead of Swiss Cheese: Gruyère
- Instead of Parmesan Cheese: Pecorino Romano
Equipment Needed
- Large Heavy‑Bottomed Pot or Dutch Oven
- Chef’s Knife
- Cutting Board
- Wooden Spoon or Heat‑Resistant Spatula
- Measuring Cups and Spoons
- Rimmed Baking Sheet
- Broiler (oven setting)
- Ladle
Critical Steps — Do Not Skip
- Caramelizing the onions slowly over medium‑low heat to develop deep flavor without burning.
- Deglazing with sherry to lift the fond and add complexity.
- Broiling the cheese‑topped bread just until bubbly; over‑broiling can cause burnt cheese.
Chef Tips from the Video
- Use a heavy‑bottomed pot to prevent scorching during the long caramelization.
- Add a pinch of sugar only if the onions are not caramelizing after 20 minutes.
- Fresh thyme adds brightness; if using dried, triple the amount.
Troubleshooting
Onions burned instead of caramelizing.
Reduce heat to medium‑low, add a splash of water or broth, and stir more frequently.
Soup tastes flat or too salty.
Adjust seasoning after simmering; add a pinch of sugar or a splash of sherry to deepen flavor if flat.
Cheese does not melt or bubbles over.
Place the baking sheet on a lower rack and broil for a shorter time, or grate the cheese finer for quicker melt.
Storage
Refrigerator: Store soup in an airtight container for up to 3 days. Keep croutons separate and re‑broil before serving.
Freezer: Freeze soup (without bread) in freezer‑safe bags for up to 2 months. Thaw overnight in fridge and reheat gently.
Room temperature: Do not leave at room temperature for more than 2 hours.
Make-Ahead Tips
- Prepare the soup a day ahead; refrigerate and gently reheat on the stove.
- Bread can be toasted just before serving; keep cheese ready for a quick broil.
- If freezing, omit the bread and cheese; add fresh toppings after reheating.
Frequently Asked Questions
What is the cultural significance and history of French Onion Soup in French cuisine?
French Onion Soup, or Soupe à l’oignon, originated in 18th‑century France as a peasant dish using inexpensive onions and stale bread. It became popular in Parisian cafés in the 19th century, especially after the addition of gratinated cheese, turning it into a classic comfort food served in both homes and bistros.
What are the traditional regional variations of French Onion Soup in French cuisine?
In the Alsace region, the soup may be finished with a splash of white wine instead of sherry. In Lyon, a richer version uses demi‑glace and sometimes a splash of cognac. The classic Parisian style always features a crusty baguette slice topped with melted Gruyère or Swiss cheese under the broiler.
How is French Onion Soup traditionally served in France?
Traditionally, the soup is ladled into shallow oven‑proof bowls, a toasted baguette slice is placed on top, and a generous amount of grated cheese is added. The bowls are then placed under a broiler or salamander until the cheese is bubbling and golden, creating a crunchy, cheesy crust.
What occasions or celebrations is French Onion Soup traditionally associated with in French culture?
French Onion Soup is often enjoyed as a starter during colder months, at family gatherings, and in bistro settings. It is also a popular dish for holiday meals such as Christmas Eve in many French households because of its warm, comforting nature.
What makes French Onion Soup special or unique in French cuisine?
The soup’s depth comes from the slow caramelization of onions, which transforms their natural sugars into a sweet‑savory base, and the combination of beef broth, sherry, and fresh herbs adds complexity. The finishing cheese‑topped crouton provides a textural contrast that is iconic to the dish.
What are the most common mistakes to avoid when making French Onion Soup?
Common errors include cooking the onions on too high heat, which burns them instead of caramelizing; skipping the deglazing step, which leaves flavor on the pot; and over‑broiling the cheese, which can become bitter. Keep the heat low, deglaze with sherry, and watch the cheese closely under the broiler.
Why does this French Onion Soup recipe use both butter and olive oil instead of just one fat?
Butter provides rich, nutty flavor, while olive oil raises the smoke point, preventing the butter from burning during the long caramelization. The combination ensures the onions develop deep flavor without scorching.
Can I make French Onion Soup ahead of time and how should I store it?
Yes, the soup can be prepared a day ahead. Cool it quickly, transfer to airtight containers, and refrigerate for up to 3 days. Reheat gently on the stove and add fresh toasted cheese‑topped croutons just before serving.
What texture and appearance should I look for when caramelizing the onions for French Onion Soup?
The onions should shrink dramatically, turn a deep golden‑brown color, and become soft and glossy, almost melting into the pot. They should not be crispy or burnt; the goal is a sweet, velvety base.
What does the YouTube channel Allrecipes specialize in?
The YouTube channel Allrecipes focuses on home‑cooked, family‑friendly recipes that use everyday ingredients. It offers step‑by‑step video guides, cooking tips, and variations for a wide range of cuisines, making cooking accessible to beginners and experienced cooks alike.
How does the YouTube channel Allrecipes' approach to French cooking differ from other French cooking channels?
Allrecipes presents French dishes like French Onion Soup with a practical, no‑fuss mindset, emphasizing ingredient accessibility and clear, concise instructions. Unlike some specialty French channels that may focus on technique-heavy or gourmet presentations, Allrecipes tailors recipes for the everyday home cook.
Last updated: August 20, 2026
