French Onion Soup with Gruyere | CookOS

French Onion Soup

Name: French Onion Soup with Gruyere
Prep time: 15 min
Cook time: 45 min
Total time: 1 h
Yield: 4 servings
Cuisine: French
Ingredients: 4 tbsp butter; 4 lb onions, sliced; 4 cloves garlic, minced; 3 tbsp all-purpose flour; 1 cup dry white wine; 8 cups beef broth; 1 bay leaf; 1 tbsp dried thyme; 1 tsp Worcestershire sauce; 1 baguette, sliced; 8 oz Gruyere cheese, shredded

French onion soup is a classic bistro dish of deeply caramelized onions simmered in rich beef broth, finished with a toasted baguette slice and bubbly melted Gruyere cheese for savory, umami-forward comfort.

🌍French 🏷️French onion soup 🏷️Soup 🏷️Gruyere 🏷️Caramelized onions Beef broth

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Total

Servings

Difficulty

Medium

Est. Cost

$22–$36

Recipe Source

View original recipe

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Ingredients

4 tbsp butter
4 lb onions, sliced
4 cloves garlic, minced
3 tbsp all-purpose flour
1 cup dry white wine
8 cups beef broth
1 bay leaf
1 tbsp dried thyme
1 tsp Worcestershire sauce
1 baguette, sliced
8 oz Gruyere cheese, shredded

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Instructions

1
In a large pot or Dutch oven, melt the butter over medium heat.
2
Add the sliced onions and cook, stirring occasionally, for about 30 minutes until they are soft and deeply caramelized.
3
Add the minced garlic and cook for another minute until fragrant.
4
Stir in the flour and cook for 1 minute.
5
Pour in the white wine to deglaze the pot, scraping up any browned bits from the bottom.
6
Add the beef broth, bay leaf, thyme, and Worcestershire sauce. Stir to combine.
7
Bring the soup to a simmer and let it cook while you prepare the toast.
8
Toast the baguette slices in the oven until golden and crisp.
9
Ladle the hot soup into oven-safe bowls.
10
Place a slice of toasted baguette on top of the soup in each bowl.
11
Generously cover the toast with shredded Gruyere cheese.
12
Place the bowls on a baking sheet and broil for 2-3 minutes, or until the cheese is melted, bubbly, and golden brown. Watch carefully to prevent burning.

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Tips & Notes

Pro tips

Slice onions evenly (about ¼ inch) so they cook uniformly and develop an even caramel color without burning.
Use medium-low heat during caramelization and stir every 5–10 minutes; rushing with high heat produces a burnt, bitter flavor.
Toast baguette slices under the broiler until golden and crisp before topping with cheese; this prevents them from becoming soggy.
Broil the finished bowl 2–3 minutes until cheese is bubbly and lightly browned; overheating can scorch the bread.

Substitutions

Dry white wine → dry sherry or brandy (reduces acidity slightly, adds depth)
All-purpose flour → cornstarch (use 2 tbsp instead of 3; thickens faster but less traditional)
Worcestershire sauce → soy sauce (adds umami, use ½ tsp to avoid oversalting)

Storage & make-ahead

Refrigerate cooled soup for up to 3 days; do not add cheese and bread topping until reheating and broiling. Freeze the soup (without topping) for up to 2 months.

Equipment

Heavy-bottomed pot or Dutch oven (at least 5 quart capacity for even heat distribution during caramelization) · Broiler-safe soup bowls or crocks (traditional French onion soup bowls are ideal) · Oven broiler

Common Questions

How long does it take to caramelize the onions?

Onions typically need 45–60 minutes of low, steady heat with occasional stirring to develop deep color and sweetness. Do not rush this step; it is essential to the soup's flavor.

Can I make French onion soup ahead?

Yes. Prepare the soup through the broth stage and refrigerate for up to 3 days. Reheat gently, then top with baguette and Gruyere and broil just before serving.

What can I substitute for Gruyere cheese?

Swiss cheese or Emmental work well as alternatives. Avoid pre-shredded cheese, which contains anti-caking agents; use freshly grated or sliced cheese for clean melting.

Can I use vegetable broth instead of beef broth?

Vegetable broth will lighten the soup considerably. Beef broth is traditional and provides the rich, savory depth that defines French onion soup.

Why is my soup not thickening?

The flour creates a light roux-thickened base. If you prefer a thicker consistency, simmer uncovered longer to reduce the broth, or whisk additional flour with water and stir in gradually.