Classic French Onion Soup
Classic French Onion Soup is a medium French recipe that serves 6. 340 calories per serving. Recipe by Adam Garratt on YouTube.
Prep: 25 min | Cook: 1 hr 36 min | Total: 2 hrs 21 min
Cost: $14.34 total, $2.39 per serving
Ingredients
- 1 liter Beef Stock (good quality, preferably low‑sodium or homemade)
- 0.5 tablespoon Olive Oil (extra virgin preferred)
- 10 grams Butter (small knob, optional for richer flavor)
- 1 tablespoon Plain Flour (all‑purpose flour)
- 150 grams Gruyère Cheese (grated; can substitute Emmental)
- 1 clove Garlic (halved for rubbing on croutons)
- 1 leaf Bay Leaf (fresh from garden or dried)
- 1 piece Baguette (about 250 g, sliced into croutons)
- 1 teaspoon Salt (to taste)
- 0.5 teaspoon Black Pepper (freshly ground)
- 1 kilogram Onions (yellow onions, sliced thin)
- 250 ml White Wine (dry white wine such as Sauvignon Blanc)
Instructions
Slice the Onions
Peel and thinly slice 1 kg of yellow onions. Try to keep the slices uniform for even cooking.
Time: PT15M
Caramelize the Onions
Heat 0.5 Tbsp olive oil and the optional 10 g butter in a frying pan over low heat. Add the sliced onions and the bay leaf. Stir every 5‑10 minutes and cook for 30‑40 minutes until the onions are deep golden‑brown and jammy.
Time: PT35M
Deglaze with White Wine
Increase heat to medium, pour in 250 ml dry white wine, and stir to loosen the browned bits. Let it reduce to about one‑third of the original volume, about 5‑10 minutes.
Time: PT8M
Add Flour
Sprinkle 1 Tbsp plain flour over the onion‑wine mixture, stir well, and cook for 2‑3 minutes to eliminate the raw flour taste.
Time: PT3M
Add Beef Stock and Simmer
Transfer the onion mixture to a large pot. Add the beef stock gradually, stirring to combine. Bring to a gentle simmer and cook uncovered for 30‑40 minutes on low heat, allowing the flavors to meld.
Time: PT35M
Prepare Croutons
Slice the baguette into 1‑inch cubes. Lightly toast the cubes in a toaster or under the oven broiler until just golden. While still warm, rub each piece with the cut side of the garlic clove.
Time: PT10M
Season the Soup
Season the simmered soup with salt and freshly ground black pepper to taste. Give it a final stir.
Time: PT2M
Assemble and Broil
Ladle the hot soup into oven‑safe bowls. Place a handful of garlic‑rubbed croutons on top, sprinkle generously with the grated Gruyère cheese, and broil on high for about 5 minutes until the cheese is bubbling and golden.
Time: PT5M
Temperature: Broil
Nutrition Facts
- Calories
- 340
- Protein
- 12 g
- Carbohydrates
- 30 g
- Fat
- 18 g
- Fiber
- 3 g
Dietary info: Contains gluten, Contains dairy, Not vegetarian
Allergens: Dairy, Gluten, Sulfites
Ingredient Substitutions
- Instead of Beef Stock: vegetable stock, chicken stock
- Instead of Olive Oil: canola oil, vegetable oil
- Instead of Butter: margarine, olive oil
- Instead of Plain Flour: whole wheat flour
- Instead of Gruyère Cheese: Emmental, Swiss cheese
- Instead of Garlic: garlic powder (use sparingly)
- Instead of Bay Leaf: dried bay leaf
- Instead of Baguette: French bread, Italian ciabatta
- Instead of Onions: sweet onions
- Instead of White Wine: dry sherry, apple cider
Equipment Needed
- Frying Pan
- Large Pot or Saucepan
- Cutting Board
- Chef's Knife
- Wooden Spoon or Heat‑Resistant Spatula
- Measuring Cups and Spoons
- Cheese Grater
- Oven‑Safe Soup Bowls
- Broiler/Grill Setting in Oven
- Toaster or Oven for Croutons
Critical Steps — Do Not Skip
- Caramelizing the onions to a deep golden brown without burning
- Reducing the white wine properly
- Cooking the flour to eliminate raw taste
- Simmering the soup long enough for flavors to meld
- Broiling the cheese until bubbling and golden
Chef Tips from the Video
- Use a high‑quality beef stock; it is the backbone of the flavor.
- A mix of Gruyère and Emmental gives a richer, more complex melt.
- Add a splash of dry sherry with the wine for extra depth.
- A cast‑iron skillet retains heat evenly, making caramelization easier.
- Toast the croutons with a light brush of butter for added richness.
Troubleshooting
Onions burn before turning soft.
Reduce the heat further and add a splash of water; cook slower for better caramelization.
Soup is too thin.
Let it simmer uncovered a bit longer to reduce, or add a teaspoon more flour mixed with a little cold stock.
Cheese does not melt or brown.
Make sure the broiler is pre‑heated and the bowls are placed close to the heat source; use a high‑fat cheese like Gruyère.
Storage
Refrigerator: Store 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; soup is perishable.
Make-Ahead Tips
- Caramelize the onions up to 2 days ahead and store them in the fridge.
- Prepare the croutons and keep them in an airtight bag; toast just before serving.
- The soup can be assembled and refrigerated; broil the cheese right before eating.
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 the 18th‑century kitchens of Parisian taverns as a humble peasant dish that turned stale bread and onions into a hearty meal. Over time it became a classic of French bistro cuisine, celebrated for its deep, caramelized flavor and elegant presentation with melted cheese.
What are the traditional regional variations of French Onion Soup in France?
In the Alsace region, the soup is often finished with a splash of dry white wine and a slice of toasted pain de campagne. In Lyon, cooks may add a touch of brandy or cognac. Some coastal versions incorporate seafood stock for a maritime twist, but the core caramelized onion base remains the same.
What is the authentic traditional way French Onion Soup is served in France?
Traditionally, the soup is ladled into thick‑walled stoneware bowls, topped with a large slice of toasted baguette, a generous layer of Gruyère or Comté cheese, and then placed under a hot broiler until the cheese bubbles and turns golden. It is served hot, often with a side of mixed greens.
What occasions or celebrations is French Onion Soup traditionally associated with in French culture?
French Onion Soup is a classic winter comfort food and is commonly served at family gatherings, after‑church meals, and during the colder months. It also appears on many bistro menus as a starter for festive dinners and holiday celebrations.
How does French Onion Soup fit into the broader French cuisine tradition?
The soup exemplifies French culinary principles: simple, high‑quality ingredients transformed through technique (slow caramelization) into a refined dish. It showcases the French love of broth‑based soups, the use of cheese as a finishing element, and the importance of texture contrast between soft onions and crunchy croutons.
What are the authentic traditional ingredients for French Onion Soup versus acceptable substitutes?
Authentic ingredients include yellow onions, beef stock, dry white wine, butter, olive oil, bay leaf, Gruyère (or Comté) cheese, and a sturdy baguette. Acceptable substitutes are vegetable or chicken stock (though flavor changes), dried bay leaf, Emmental cheese instead of Gruyère, and any crusty French‑style bread for croutons.
What are the most common mistakes to avoid when making French Onion Soup?
Common errors include cooking the onions on too high a heat, which burns them; adding the flour too early, causing lumps; not reducing the wine enough, leaving a harsh flavor; and broiling the cheese for too long, which can turn it bitter. Patience during caramelization is key.
Why does this French Onion Soup recipe use flour as a thickener instead of a roux made with butter?
The recipe adds a small amount of flour directly to the caramelized onions to lightly thicken the broth without creating a heavy roux. This keeps the soup silky while still allowing the deep onion flavor to shine, and it simplifies the process for home cooks.
How do I know when the onions are properly caramelized for French Onion Soup?
Properly caramelized onions will have a deep, uniform golden‑brown color and a sweet, jammy aroma. They should have reduced in volume by about half and feel soft when pressed, without any raw bite or burnt edges.
What does the YouTube channel Adam Garratt specialize in?
The YouTube channel Adam Garratt focuses on approachable home‑cooking tutorials, often featuring comfort‑food classics, brunch ideas, and straightforward techniques that help everyday cooks achieve restaurant‑quality results.
How does the YouTube channel Adam Garratt's approach to French cooking differ from other cooking channels?
Adam Garratt emphasizes simplicity and honesty, sharing personal anecdotes and real‑world tips (like using frozen onions or optional butter) while still respecting traditional flavors. His relaxed style contrasts with highly polished productions, making French recipes feel accessible to beginners.
Last updated: August 20, 2026
