How Chefs Make French Onion Soup (It's Not About the Onions)
How Chefs Make French Onion Soup (It's Not About the Onions) is a medium French recipe that serves 6. 250 calories per serving. Recipe by Fallow on YouTube.
Prep: 30 min | Cook: 2 hrs 55 min | Total: 3 hrs 45 min
Cost: $94.70 total, $15.78 per serving
Ingredients
- 2 pounds Beef Bones with Marrow (mixed beef bones with marrow, optional but adds depth)
- 1 pound Beef Trim (aged ribeye trim or cheap stewing steak, roasted for stock)
- 4 cups Store-Bought Beef Stock (low‑sodium, used as base for the homemade stock)
- 2 cups Store-Bought Chicken Stock (light flavor to balance the beef richness)
- 2 pieces Carrots (roughly chopped, adds sweetness to stock)
- 2 stalks Celery Stalks (roughly chopped, adds aromatics)
- 1 piece Onion (for stock) (medium, roughly chopped)
- 2 cloves Garlic (minced)
- 2 sprigs Fresh Thyme (plus extra for garnish)
- 1 sprig Fresh Rosemary (optional, adds depth)
- 1 cup Dry Red Wine (helps deglaze and adds sweetness)
- 4 pieces Spanish or Roscoff Onions (thinly sliced, sweet flavor for caramelization)
- 4 tablespoons Unsalted Butter (for sautéing onions and making roux)
- 2 tablespoons All-Purpose Flour (for the burmanet (roux))
- 1 loaf French Baguette (day‑old, sliced 1‑inch thick for topping)
- 1 cup Gruyère Cheese (shredded, for broiling)
- 2 tablespoons Fresh Chives (chopped, garnish)
- to taste Salt (for seasoning onions and final soup)
- to taste Black Pepper (freshly ground)
Instructions
Roast Bones and Beef Trim
Preheat the oven to 180°C (350°F). Place the beef bones with marrow and the beef trim on a roasting pan, rub lightly with salt, and roast for about 35 minutes until golden‑brown but not burnt.
Time: PT35M
Temperature: 180°C
Prepare Aromatics for Stock
While the bones roast, roughly chop carrots, celery, and a medium onion. Mince garlic. Set aside.
Time: PT10M
Deglaze with Wine
Remove the roasted bones and trim from the oven. Transfer to the Dutch oven, add the chopped vegetables, garlic, thyme, and rosemary. Pour in 1 cup of dry red wine, scraping up any browned bits. Reduce the wine by half over medium heat.
Time: PT10M
Simmer the Stock
Add the roasted bones, beef trim, 4 cups beef stock, 2 cups chicken stock, and enough water to cover (about 2‑3 quarts). Bring to a gentle simmer, then reduce heat to low and cook uncovered for 1 hour 30 minutes, skimming the surface every 20 minutes to remove foam and excess fat.
Time: PT90M
Strain and Finish Stock
After simmering, remove the bones and vegetables. Strain the liquid through a fine mesh sieve into a clean pot. Discard solids. Add additional 2 cups of light chicken stock if the broth is too intense. Keep warm on low heat.
Time: PT10M
Caramelize Onions
In a large heavy‑bottom pan, melt 4 tbsp butter over low heat. Add the sliced onions, sprinkle with a pinch of salt, cover, and cook for 25 minutes, stirring occasionally. Uncover and continue cooking, stirring frequently, for another 5‑7 minutes until the onions are deep golden and sweet but not burnt.
Time: PT30M
Make the Burmanet (Roux)
In a separate small saucepan, melt 2 tbsp butter, whisk in 2 tbsp flour, and cook over medium‑low heat, stirring constantly, until the mixture turns a light golden color (about 3‑4 minutes). Do not let it brown too dark.
Time: PT5M
Combine Roux and Stock
Whisk the roux into the warm stock a little at a time, ensuring no lumps form. Bring the soup to a gentle boil for 5 minutes to cook out the raw flour taste, then reduce to a low simmer.
Time: PT10M
Season and Finish Soup
Taste the soup and adjust with salt and freshly ground black pepper. Add the caramelized onions, stirring to distribute evenly. Keep the soup warm.
Time: PT5M
Prepare Bread and Cheese Topping
Preheat the broiler. Slice the baguette into 1‑inch thick rounds, place on a baking sheet, and toast lightly for 2 minutes. Top each slice with a generous amount of shredded Gruyère.
Time: PT5M
Broil and Serve
Ladle hot soup into oven‑safe bowls, float a cheese‑topped baguette slice on top of each, and place under the broiler until the cheese bubbles and turns golden (about 2‑3 minutes). Garnish with chopped chives and a sprig of thyme.
Time: PT5M
Nutrition Facts
- Calories
- 250
- Protein
- 12g
- Carbohydrates
- 20g
- Fat
- 12g
- Fiber
- 2g
Dietary info: Contains meat, Contains dairy, Contains gluten
Allergens: Dairy, Gluten
Ingredient Substitutions
- Instead of Beef Bones with Marrow: Chicken carcass, Chicken wings
- Instead of Beef Trim: Stewing beef, Beef short ribs
- Instead of Store-Bought Beef Stock: Homemade beef stock, Vegetable stock
- Instead of Store-Bought Chicken Stock: Homemade chicken stock, Vegetable stock
- Instead of Carrots: Parsnips
- Instead of Celery Stalks: Leek
- Instead of Onion (for stock): Shallot
- Instead of Garlic: Garlic paste
- Instead of Fresh Thyme: Dried thyme (1/2 tsp)
- Instead of Fresh Rosemary: Dried rosemary (1/4 tsp)
- Instead of Dry Red Wine: Sherry, Marsala
- Instead of Spanish or Roscoff Onions: Yellow onions, Sweet onions
- Instead of Unsalted Butter: Clarified butter, Olive oil (less flavor)
- Instead of All-Purpose Flour: Gluten‑free flour blend
- Instead of French Baguette: Italian ciabatta, sourdough
- Instead of Gruyère Cheese: Emmental, Swiss cheese
- Instead of Fresh Chives: Green onions
- Instead of Salt: Sea salt
- Instead of Black Pepper: White pepper
Equipment Needed
- Oven
- Roasting Pan
- Heavy‑Bottom Dutch Oven or Large Pot
- Knife
- Cutting Board
- Fine Mesh Sieve
- Ladle
- Wooden Spoon
- Whisk (optional)
- Broiler (or salamander)
- Grater
Critical Steps — Do Not Skip
- Roasting the bones and beef trim to develop deep flavor.
- Slowly caramelizing the onions over low heat with a lid.
- Skimming fat and impurities to keep the stock clear.
- Making a light burmanet roux and fully incorporating it without lumps.
- Broiling the cheese‑topped bread just until golden.
Chef Tips from the Video
- Combine both beef and chicken stock for a balanced richness.
- A splash of sherry or a teaspoon of balsamic vinegar at the end brightens the flavor.
- Use a mix of Spanish onions and Roscoff onions for layered sweetness.
- If you lack a broiler, place the cheese‑topped bread under a very hot oven rack.
Troubleshooting
Soup is too watery.
Simmer longer to reduce, or add a bit more roux (mix flour with cold water first).
Onions burned or bitter.
Cook them on low heat with a lid, stirring frequently; if they start to brown too fast, add a splash of water.
Stock is cloudy.
Skim foam frequently and strain through a fine mesh sieve or cheesecloth; avoid boiling vigorously.
Soup is too thick after adding roux.
Thin with extra warm stock or water until desired consistency is reached.
Storage
Refrigerator: Store soup in airtight containers for up to 4 days.
Freezer: Freeze in portion‑size bags for up to 2 months; thaw gently before reheating.
Room temperature: Do not leave at room temperature for more than 2 hours.
Make-Ahead Tips
- Prepare the beef‑chicken stock up to 2 days ahead and refrigerate; reheat gently before use.
- Caramelize the onions a day ahead, store in the fridge, and add to the soup when finishing.
- The roux can be made in advance and kept refrigerated for up to 3 days.
Frequently Asked Questions
What is the cultural significance and history of French onion soup in French cuisine?
French onion soup originated as a humble peasant dish in 18th‑century France, using stale bread and inexpensive onions to create a nourishing meal. Over time it became a classic of French bistro cooking, celebrated for its deep caramelized flavor and comforting warmth, especially in winter.
What are the traditional regional variations of French onion soup in France?
In Parisian bistros the soup is typically finished with Gruyère and a toasted baguette slice, while in the Lyon region a richer beef broth and sometimes a splash of cognac are used. Alpine versions may add cheese such as Comté, and some coastal areas incorporate a hint of white wine.
How is French onion soup traditionally served in French bistro culture?
Traditionally the soup is ladled into a shallow, oven‑safe bowl, topped with a thick slice of toasted baguette, covered with generous grated Gruyère, and then broiled until the cheese forms a bubbling, golden crust. It is served hot, often with a side of mixed greens.
During which occasions or celebrations is French onion soup traditionally enjoyed in French culture?
French onion soup is a staple during the colder months and is often served as a starter at family gatherings, holiday meals, and festive bistro brunches. It is also a popular comfort food on rainy evenings and at traditional winter markets.
How does French onion soup fit into the broader French cuisine tradition?
The soup exemplifies French cuisine’s emphasis on technique—slow caramelization, careful stock making, and finishing with a gratinated cheese crust. It showcases the French principle of turning simple, inexpensive ingredients into a refined, layered dish.
What are the authentic traditional ingredients for French onion soup versus acceptable substitutes?
Authentic ingredients include beef marrow bones, beef trim, yellow or sweet onions, dry red wine, beef stock, butter, flour (burmanet), French baguette, and Gruyère cheese. Acceptable substitutes are chicken carcass for bones, yellow onions for Roscoff, and Swiss or Emmental cheese instead of Gruyère.
What other French dishes pair well with French onion soup?
French onion soup pairs beautifully with classic French salads such as Salade Lyonnaise, a simple green salad with bacon and poached egg, or a side of roasted pork tenderloin. A glass of dry Burgundy or a light Beaujolais complements the rich flavors.
What makes French onion soup special or unique in French cuisine?
Its uniqueness lies in the layered depth of flavor achieved through caramelized onions, a clear yet rich bone‑based stock, and the final gratinated cheese topping that adds texture and richness in one bite.
What are the most common mistakes to avoid when making French onion soup at home?
Common mistakes include boiling the stock instead of simmering (which makes it cloudy), rushing the onion caramelization (resulting in bitterness), and adding too much flour which can make the soup gummy. Skimming fat and impurities and using low heat for the onions are key.
How do I know when the onions are properly caramelized for French onion soup?
Properly caramelized onions turn a deep golden‑brown color, become soft and sweet, and lose any raw bite. They should smell fragrant and slightly nutty, and when pressed, they should melt together without any crunchy pieces.
Can I make French onion soup ahead of time and how should I store it?
Yes, you can prepare the stock and caramelized onions up to two days in advance, storing each in airtight containers in the refrigerator. Reheat gently, combine, and add fresh toasted baguette and cheese just before serving.
What does the YouTube channel Fallow specialize in?
The YouTube channel Fallow specializes in in‑depth, technique‑focused cooking tutorials that blend culinary science with classic recipes, often highlighting traditional dishes with modern twists and detailed explanations.
How does the YouTube channel Fallow's approach to French cooking differ from other French cooking channels?
Fallow emphasizes the foundational importance of stock and flavor layering, spending extra time on bone roasting and slow caramelization, whereas many other French cooking channels may shortcut these steps. The channel also provides extensive background on ingredient sourcing and culinary history.
Last updated: August 19, 2026
