What is French onion soup made of?

French onion soup is made from a handful of humble ingredients: caramelized yellow or brown onions, butter, flour, and broth — usually chicken, beef, or vegetable. It’s seasoned with herbs like thyme and bay leaf, then topped with slices of toasted French bread covered in melted cheese. The slow cooking process transforms these simple components into a rich and deeply satisfying dish that’s both rustic and elegant.

What is the secret to French onion soup?

The secret lies in patience — particularly with caramelizing the onions. Slow, even heat allows their natural sugars to develop, creating the soup’s signature sweetness and complexity. Another key is using a well-balanced broth that complements, not overpowers, the onions. Finally, the cheesy toast topping, broiled until golden and bubbly, adds an irresistible finishing touch that makes French onion soup unforgettable.

What is the difference between onion soup and French onion soup?

While all French onion soup is a type of onion soup, not all onion soups qualify as French. The French version is distinguished by its slow-cooked caramelized onions, deeply flavored broth, and a gratinéed topping of cheesy toast. Regular onion soup may skip the caramelization or topping altogether, resulting in a lighter, simpler soup that lacks the richness and texture of its French counterpart.

Is French onion soup good or bad for you?

French onion soup can be both — it depends on your dietary needs and how it’s prepared. On the plus side, it’s rich in flavor and comforting, with protein from cheese and nutrients from onions. On the downside, it’s often high in sodium and saturated fat. Using lower-sodium broth, less cheese, and lighter bread can make it more health-friendly while keeping its cozy appeal.

French Onion Soup: A Rich Classic with Irresistible Comfort

Description

French Onion Soup made easy with caramelized onions, broth, and cheesy toast. Learn the secret to this iconic comfort soup.

Ingredients

- 7 tablespoons unsalted butter
- 2.5 pounds yellow or brown onions, peeled, halved, and thinly sliced top to bottom
- 2 tablespoons all-purpose flour
- 6 cups low-sodium chicken broth (or vegetable broth)
- 2 dried bay leaves or 3 fresh
- 3 sprigs fresh thyme (optional)
- Salt and black pepper, to taste

For the Cheesy Toast:

- 6 to 8 slices soft French baguette or similar bread
- 3.5 ounces shredded mozzarella or another good melting cheese
- Fresh parsley or thyme leaves for garnish (optional)

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Instructions

Caramelize the Onions:
- Melt butter in a large, heavy pot over medium heat. Add onions and stir to coat.
- Reduce heat to medium-low and cook onions for 30 minutes, stirring every few minutes until softened and semi-transparent.
- Increase heat to medium-high, sprinkle in a pinch of salt, and continue cooking for another 20 to 30 minutes, stirring more frequently. The onions should become deeply golden and sweet.
Make the Soup:
- Sprinkle flour over the caramelized onions and stir for 1 minute.
- Add broth, bay leaves, and thyme. Stir to combine.
- Bring to a gentle simmer, cover, and let it cook for 30 minutes. Season with salt and pepper to taste.
Prepare the Cheesy Toast:
- Preheat the broiler on high. Lightly toast bread slices on both sides.
- Top each slice with shredded cheese and broil until the cheese is melted and golden brown in spots.
Serve:
- Ladle the hot soup into bowls. Place one or two cheesy toasts on top of each bowl. Garnish with herbs if desired.

Prep Time: 20 minutes
Cook Time: 1 hour 30 minutes
Category: SOUPS
Method: Stovetop
Cuisine: French