Classic French Onion Soup
Classic French Onion Soup is a medium French recipe that serves 4. 300 calories per serving. Recipe by SAM THE COOKING GUY on YouTube.
Prep: 25 min | Cook: 1 hr 30 min | Total: 2 hrs 10 min
Cost: $10.25 total, $2.56 per serving
Ingredients
- 3 pounds Yellow Onions (peeled and thinly sliced)
- 0.25 cup Unsalted Butter (cut into cubes)
- 2 tablespoons Olive Oil (extra virgin preferred)
- 3 cloves Garlic (large, minced)
- 5 cups Beef Broth (low-sodium preferred)
- 3 tablespoons Dry Sherry (adds depth of flavor)
- 2 teaspoons Fresh Thyme (leaves stripped from stems)
- 2 tablespoons Soy Sauce (regular, not low-sodium)
- to taste to taste Salt
- to taste to taste Black Pepper
- 1 piece Baguette (Batard) (about 8 inches, sliced diagonally)
- 1 cup shredded Gruyère Cheese (sharp, aged)
Instructions
Slice the onions
Peel the onions and slice them thinly (about 1/8 inch) using a mandoline or a sharp chef's knife.
Time: PT10M
Caramelize the onions
In a large pot over medium‑low heat, melt the butter with the olive oil. Add the sliced onions, stir to coat, and cook, stirring occasionally, until deep golden brown and sweet, about 25 minutes.
Time: PT25M
Add garlic and aromatics
Create a small well in the onions, add the minced garlic and a drizzle of oil, sauté for about 1 minute until fragrant. Stir in the sherry and fresh thyme.
Time: PT2M
Add broth and soy sauce
Pour in the beef broth, add soy sauce, and season with salt and pepper. Stir to combine.
Time: PT2M
Simmer the soup
Bring the mixture to a gentle simmer (do not boil) and let it cook for 25 minutes, allowing the flavors to meld.
Time: PT25M
Toast the bread
While the soup simmers, preheat the oven to 350°F. Slice the baguette diagonally into two pieces, place on a baking sheet, and bake for 10 minutes until dry and lightly crisp.
Time: PT10M
Temperature: 350°F
Grate the cheese
Grate the Gruyère cheese using the large‑hole side of a box grater.
Time: PT3M
Assemble and broil
Ladle the hot soup into oven‑safe bowls, place a toasted baguette slice on top, and sprinkle a generous amount of grated Gruyère. Place the bowls on a baking sheet and broil on high (about 450°F) for 5 minutes, or until the cheese is bubbling and golden.
Time: PT5M
Temperature: 450°F
Serve
Remove the bowls from the oven, let cool for 2 minutes, then serve hot. Enjoy the rich, aromatic soup with its crispy, cheesy topping.
Time: PT2M
Nutrition Facts
- Calories
- 300
- Protein
- 12 g
- Carbohydrates
- 30 g
- Fat
- 12 g
- Fiber
- 3 g
Dietary info: Contains meat (beef broth), Contains dairy, Contains gluten, Contains soy
Allergens: Dairy, Gluten, Soy
Ingredient Substitutions
- Instead of Yellow Onions: Sweet onions, Red onions
- Instead of Unsalted Butter: Margarine, Olive oil
- Instead of Olive Oil: Vegetable oil, Canola oil
- Instead of Garlic: 1 tsp garlic paste, garlic powder (1/2 tsp)
- Instead of Beef Broth: Vegetable broth, Chicken broth
- Instead of Dry Sherry: White wine, Apple cider vinegar (1 tsp)
- Instead of Fresh Thyme: Dried thyme (1 tsp)
- Instead of Soy Sauce: Tamari, Liquid aminos
- Instead of Salt: Kosher salt, Sea salt
- Instead of Black Pepper: White pepper
- Instead of Baguette (Batard): French bread, Ciabatta
- Instead of Gruyère Cheese: Emmental, Swiss cheese
Equipment Needed
- Large pot or Dutch oven
- Chef's knife
- Cutting board
- Mandoline slicer (optional)
- Ladle
- Baking sheet
- Oven
- Box grater (large holes)
- Silicone-tipped tongs (optional)
- Oven-safe soup bowls
Critical Steps — Do Not Skip
- Caramelizing the onions slowly over medium‑low heat
- Drying the baguette slices sufficiently to hold up under the broth
- Broiling the cheese until bubbling and golden without burning
Chef Tips from the Video
- A splash of dry sherry adds depth without overwhelming the soup.
- Soy sauce provides umami and a richer color without tasting Asian.
- Use a mix of fresh thyme leaves and a tiny pinch of dried thyme for layered herb flavor.
Troubleshooting
Onions burned or turned black.
Reduce heat to medium‑low and stir more frequently; add a splash of water if the pan becomes too dry.
Soup is too thin.
Simmer longer to reduce, or add an extra ladle of broth and let it continue to simmer until desired thickness.
Bread becomes soggy instead of crisp.
Make sure the bread is fully dried in the oven; you can toast it a few minutes longer or use a toaster oven.
Cheese does not melt or brown.
Place the bowls under a hot broiler (450°F) and watch closely; if your broiler is weak, move the bowls closer to the heating element.
Storage
Refrigerator: Store soup in an airtight container for up to 3 days. Reheat gently on the stove.
Freezer: Freeze in freezer‑safe containers for up to 2 months. Thaw overnight and reheat.
Room temperature: Do not store at room temperature for more than 2 hours.
Make-Ahead Tips
- Caramelize the onions up to 24 hours ahead; store in the fridge and reheat before adding broth.
- Grate the Gruyère and keep it sealed in the fridge for quick assembly.
- Toast the baguette slices a day ahead; store in an airtight container.
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 medieval France as a peasant dish using cheap ingredients like onions and stale bread. Over time it became a classic restaurant staple, symbolizing rustic comfort and the French art of turning simple foods into elegant fare.
What are the traditional regional variations of French Onion Soup in France?
In Parisian bistros the soup is often finished with a crouton and melted Gruyère, while in the Lyon region a richer broth and sometimes a splash of cognac are added. Alpine versions may include cheese like Emmental and use beef stock enriched with wine.
How is French Onion Soup traditionally served in French restaurants?
It is traditionally served in a shallow, oven‑safe bowl, topped with a toasted baguette slice and a generous layer of grated Gruyère, then broiled until the cheese forms a bubbling, golden crust. The bowl is often presented on a wooden board to protect the table.
What occasions or celebrations is French Onion Soup traditionally associated with in French culture?
French Onion Soup is a popular starter during the colder months and is often enjoyed at family gatherings, holiday meals, and after‑work gatherings in French cafés. Its warming qualities make it a favorite for winter celebrations and cozy evenings.
What authentic traditional ingredients are essential for French Onion Soup versus acceptable substitutes?
Authentic ingredients include yellow onions, beef broth, dry sherry, fresh thyme, Gruyère cheese, and a crusty French baguette. Acceptable substitutes are vegetable broth for a vegetarian version, white wine instead of sherry, and Emmental or Swiss cheese in place of Gruyère.
What other French dishes pair well with French Onion Soup?
French Onion Soup pairs beautifully with a simple green salad dressed with vinaigrette, a classic Niçoise salad, or a light charcuterie board. For a full French meal, follow it with coq au vin or a buttery croque‑madame.
What are the most common mistakes to avoid when making French Onion Soup?
Common mistakes include cooking the onions on too high heat, which burns them; not allowing enough time for caramelization; using fresh bread that becomes soggy; and under‑broiling the cheese, leaving it unmelted. Patience and proper oven timing are key.
Why does this French Onion Soup recipe use soy sauce instead of Worcestershire sauce?
Soy sauce adds a subtle umami boost and deepens the broth’s color without imparting a distinctly Asian flavor. Worcestershire sauce contains additional spices that can mask the delicate onion‑and‑thyme profile the recipe aims for.
Can I make French Onion Soup ahead of time and how should I store it?
Yes, you can caramelize the onions and prepare the broth up to 24 hours ahead. Store the soup in an airtight container in the refrigerator, reheat gently, then add freshly toasted bread and cheese before the final broil.
What texture and appearance should I look for when the onions are properly caramelized for French Onion Soup?
Properly caramelized onions should be deep golden‑brown, soft, and glossy, with a sweet aroma. They will have reduced in volume dramatically and should coat the pot without sticking.
What does the YouTube channel SAM THE COOKING GUY specialize in?
The YouTube channel SAM THE COOKING GUY specializes in approachable, home‑cooked comfort food recipes with a focus on clear step‑by‑step instruction and a light‑hearted, conversational style.
How does the YouTube channel SAM THE COOKING GUY's approach to French cooking differ from other French cooking channels?
SAM THE COOKING GUY demystifies classic French dishes by breaking them into simple, practical steps, emphasizing that French cooking isn’t intimidating. Unlike more formal French channels, he uses everyday kitchen tools and adds humor to keep viewers engaged.
Last updated: August 20, 2026
