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

  1. Slice the Onions

    Peel and thinly slice 1 kg of yellow onions. Try to keep the slices uniform for even cooking.

    Time: PT15M

  2. 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

  3. 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

  4. 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

  5. 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

  6. 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

  7. Season the Soup

    Season the simmered soup with salt and freshly ground black pepper to taste. Give it a final stir.

    Time: PT2M

  8. 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

Last updated: April 7, 2026

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Classic French Onion Soup

Recipe by Adam Garratt

A comforting, classic French onion soup made with caramelized onions, rich beef stock, a splash of white wine, and topped with toasted baguette croutons smothered in melted Gruyère cheese. Perfect for brunch or a cozy dinner.

MediumFrenchServes 6

Shop all ingredients on Amazon in one click • Printable PDF with shopping checklist

Source Video
23m
Prep
1h 30m
Cook
14m
Cleanup
2h 7m
Total

Cost Breakdown

$14.34
Total cost
$2.39
Per serving

Critical Success Points

  • 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

Safety Warnings

  • Handle hot oil and pan with care to avoid burns.
  • Use oven mitts when removing bowls from the broiler.
  • Be cautious when working with hot broth; it can cause scalds.

Frequently Asked Questions

Everything you need to know about this recipe

Q

What is the cultural significance and history of French Onion Soup in French cuisine?

A

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.

cultural
Q

What are the traditional regional variations of French Onion Soup in France?

A

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.

cultural
Q

What is the authentic traditional way French Onion Soup is served in France?

A

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.

cultural
Q

What occasions or celebrations is French Onion Soup traditionally associated with in French culture?

A

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.

cultural
Q

How does French Onion Soup fit into the broader French cuisine tradition?

A

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.

cultural
Q

What are the authentic traditional ingredients for French Onion Soup versus acceptable substitutes?

A

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.

cultural
Q

What are the most common mistakes to avoid when making French Onion Soup?

A

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.

technical
Q

Why does this French Onion Soup recipe use flour as a thickener instead of a roux made with butter?

A

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.

technical
Q

How do I know when the onions are properly caramelized for French Onion Soup?

A

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.

technical
Q

What does the YouTube channel Adam Garratt specialize in?

A

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.

channel
Q

How does the YouTube channel Adam Garratt's approach to French cooking differ from other cooking channels?

A

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.

channel

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