French Onion Soup

French Onion Soup is a medium French recipe that serves 6. 280 calories per serving. Recipe by Natashas Kitchen on YouTube.

Prep: 25 min | Cook: 1 hr 40 min | Total: 2 hrs 25 min

Cost: $15.65 total, $2.61 per serving

Ingredients

  • 3 pounds Yellow Onions (peeled, trimmed, thinly sliced)
  • 2 tablespoons Olive Oil (extra virgin)
  • 2 tablespoons Unsalted Butter (cut into pieces)
  • 0.5 teaspoon Granulated Sugar (helps caramelization)
  • 2 cloves Garlic Cloves (minced)
  • 0.5 cup Dry Sherry (dry, for deglazing)
  • 8 cups Beef Stock (prefer stock for richness)
  • 1.5 teaspoons Salt (adjust to taste)
  • 1 leaf Bay Leaf (remove before serving)
  • 3 sprigs Fresh Thyme (remove stems before serving)
  • 1 piece Baguette (cut into ½‑inch diagonal slices (≈12 slices))
  • 8 ounces Gruyère Cheese (shredded using large holes of a box grater)
  • 0.5 teaspoon Black Pepper (freshly ground)

Instructions

  1. Prepare the Onions

    Trim the root and stem ends, peel off the outer dry layers, then thinly slice the onions parallel to the grain.

    Time: PT15M

  2. Sauté Onions in Oil & Butter

    Heat 2 Tbsp olive oil and 2 Tbsp unsalted butter in the Dutch oven over medium heat until butter melts, then add all sliced onions.

    Time: PT10M

    Temperature: medium

  3. Caramelize the Onions

    Sprinkle ½ tsp granulated sugar over the onions and continue sautéing uncovered, stirring occasionally, for about 40 minutes until deep golden‑brown and sweet.

    Time: PT40M

    Temperature: medium

  4. Add Garlic

    Mince 2 large garlic cloves and stir into the caramelized onions, cooking for 1 minute until fragrant.

    Time: PT1M

    Temperature: medium

  5. Deglaze with Sherry

    Pour in ½ cup dry sherry, scraping the browned bits from the pot, and simmer for 3 minutes until the alcohol evaporates.

    Time: PT3M

    Temperature: medium

  6. Add Stock and Herbs, Simmer

    Add 8 cups beef stock, 1 tsp salt, 1 bay leaf, and a few sprigs of fresh thyme. Bring to a boil, partially cover, then reduce to a gentle simmer for 30 minutes.

    Time: PT30M

    Temperature: simmer

  7. Prepare Cheesy Croutons

    While the soup simmers, slice the baguette into ½‑inch diagonal pieces, brush both sides with olive oil, arrange on a baking sheet, and bake at 400°F for 6‑8 minutes until golden brown.

    Time: PT8M

    Temperature: 400°F

  8. Shred Gruyère Cheese

    Using the large holes of a box grater, shred the 8‑oz block of Gruyère cheese.

    Time: PT5M

  9. Final Seasoning

    Taste the soup and add an additional ½ tsp salt and ½ tsp freshly ground black pepper if needed. Remove the bay leaf and thyme sprigs.

    Time: PT2M

  10. Assemble and Broil

    Ladle hot soup into oven‑safe bowls, sprinkle a generous handful of shredded Gruyère into each, top with 2‑3 toasted baguette slices, add more cheese on top, and place under the broiler for 3‑5 minutes until cheese melts and turns golden.

    Time: PT5M

    Temperature: broiler

  11. Garnish and Serve

    Garnish each bowl with a small sprig of fresh thyme or chopped chives and serve immediately.

    Time: PT1M

Nutrition Facts

Calories
280
Protein
12 g
Carbohydrates
20 g
Fat
15 g
Fiber
3 g

Dietary info: Contains beef, Contains dairy, Contains gluten

Allergens: Dairy, Gluten

Last updated: April 6, 2026

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French Onion Soup

Recipe by Natashas Kitchen

A classic French onion soup with deeply caramelized onions, rich beef stock, a splash of dry sherry, and a generous topping of toasted baguette croutons smothered in melted Gruyère cheese. This restaurant‑quality soup is surprisingly easy to make at home and perfect for cozy meals or holiday gatherings.

MediumFrenchServes 6

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Source Video
38m
Prep
1h 22m
Cook
14m
Cleanup
2h 14m
Total

Cost Breakdown

$15.65
Total cost
$2.61
Per serving

Critical Success Points

  • Properly trim, peel and thinly slice the onions to ensure even caramelization
  • Caramelize onions slowly over medium heat for 40 minutes without burning
  • Simmer the soup with stock and herbs for a full 30 minutes to develop depth
  • Broil the assembled bowls just until the cheese is melted and golden, watching closely to avoid burning

Safety Warnings

  • Hot oil and butter can cause burns – handle with care
  • Use oven mitts when removing the hot baking sheet
  • When using the broiler, keep a close eye on the cheese to prevent burning
  • Wear goggles or eye protection while slicing large quantities of onions to avoid tears

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 18th‑century France as a humble peasant dish that used inexpensive onions and stale bread. Over time it became a classic of French bistro cooking, celebrated for its deep caramelized flavor and comforting warmth, especially during winter months.

cultural
Q

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

A

In the Alsace region, the soup may include a splash of white wine; in Parisian bistros, it is typically finished with a broiled Gruyère‑topped crouton. Some versions add a touch of cognac or brandy for extra depth, while others keep it strictly onion, stock, and cheese.

cultural
Q

How is French Onion Soup traditionally served in French bistros?

A

It is ladled into shallow, oven‑safe bowls, topped with a thick slice of toasted baguette, a generous layer of grated Gruyère, and then broiled until the cheese forms a bubbling, golden crust. It is often garnished with a sprig of fresh thyme or chives and served with a side of mixed greens.

cultural
Q

During which French celebrations or occasions is French Onion Soup commonly enjoyed?

A

While not tied to a specific holiday, French Onion Soup is a staple during the colder months, especially around Christmas and New Year’s Eve, and is frequently served as a starter at family gatherings and festive dinner parties in France.

cultural
Q

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

A

It exemplifies French cuisine’s ability to transform simple, inexpensive ingredients into a refined dish through technique—slow caramelization, careful deglazing, and the use of high‑quality cheese and stock—mirroring the French culinary philosophy of flavor depth and elegance.

cultural
Q

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

A

Authentic ingredients include yellow onions, beef stock, dry sherry, butter, olive oil, bay leaf, fresh thyme, and Gruyère cheese. Acceptable substitutes are white or sweet onions, chicken or vegetable stock (less rich), dry white wine instead of sherry, and Swiss or Emmental cheese in place of Gruyère.

cultural
Q

What other French dishes pair well with French Onion Soup?

A

Classic pairings include a simple green salad with vinaigrette, a crisp green bean almondine, or a light roasted chicken. For a full French bistro experience, serve the soup alongside a charcuterie board or a buttery croque‑monsieur.

cultural
Q

What makes French Onion Soup special or unique in French cuisine?

A

Its signature deep, sweet‑savory flavor comes from the slow caramelization of onions, which creates natural sugars, and the combination of a rich beef broth with a melty Gruyère‑topped crouton that adds texture and richness not found in many other soups.

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 heat, which burns them; skipping the sugar that aids caramelization; not deglazing properly, leaving flavorful fond stuck; and adding the croutons too early, causing them to become soggy.

technical
Q

Why does this French Onion Soup recipe use dry sherry instead of sweet sherry or wine?

A

Dry sherry provides acidity and depth without adding excess sweetness, allowing the natural sweetness of the caramelized onions to shine. Sweet sherry can make the broth overly sugary, while dry white wine lacks the same nutty complexity.

technical
Q

Can I make French Onion Soup ahead of time and how should I store it?

A

Yes, you can fully prepare the soup (onion caramelization, broth simmering) up to two days in advance. Store it in airtight containers in the refrigerator, reheat gently on the stove, and add freshly toasted croutons and cheese just before serving.

technical
Q

What does the YouTube channel Natashas Kitchen specialize in?

A

The YouTube channel Natashas Kitchen focuses on approachable, home‑cooked comfort foods with clear step‑by‑step instructions, often highlighting classic recipes like soups, stews, and baked dishes that deliver restaurant‑quality results for everyday cooks.

channel
Q

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

A

Natashas Kitchen emphasizes simplicity and practicality, using readily available ingredients and minimal specialized equipment, whereas many French cooking channels may rely on more advanced techniques or hard‑to‑find specialty items. Natasha also shares personal hacks, like using goggles to avoid onion tears.

channel

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