Classic French Onion Soup
Rich beef broth packed with caramelized onions, topped with a baguette slice and melted gruyere.
Details
Ingredients
- 5 large onions, thinly sliced
- 3 tbsp butter
- 1 tsp sugar
- 1 tbsp flour
- 1/2 cup white wine
- 1.5 liters beef broth
- 1 baguette, sliced
- 200g Gruyère cheese, grated
- Fresh thyme
Instructions
- 1
Melt butter in a large pot. Add onions and cook slowly over low heat for 40 minutes until caramelized and brown.
- 2
Sprinkle with sugar and flour. Cook for 1 minute.
- 3
Deglaze with white wine, scraping up browned bits.
- 4
Add beef broth and thyme. Simmer for 20 minutes.
- 5
Preheat broiler.
- 6
Ladle soup into oven-safe bowls.
- 7
Top with a slice of baguette and a mound of cheese.
- 8
Broil until cheese is bubbly and browned.
- 9
Serve carefully (hot!).
About This Recipe
The soul of French Onion Soup, or *Soupe à l'Oignon Gratinée*, lies in its profound transformation of humble onions into a dish of remarkable depth and elegance. Originating as a restorative meal for Parisian market workers and later a sophisticated offering in grand cafés, it embodies the magic of slow cooking. The meticulous, hours-long caramelization of five large onions is the cornerstone technique, coaxing out their natural sugars and creating an incredible sweetness and umami base that defines the entire experience. This patient process, coupled with careful deglazing with white wine and a robust, high-quality beef broth, develops layers of flavor far beyond the simplicity of its ingredients. The final flourish — a thick slice of baguette, soaking up the savory broth, crowned with a generous blanket of melted, bubbly Gruyère cheese — is iconic. While some variations might incorporate a splash of brandy or a mix of cheeses like Comté or Emmental, the classic calls for authentic Gruyère to achieve that perfect melt and nutty tang. It's more than just a soup; it's a comforting masterpiece, ideal as a warming starter on a chilly evening or even a satisfying light main course, often paired with a simple green salad to cut through its richness.
Tips & Tricks
- • For truly golden, deeply flavored onions, caramelize them over medium-low heat for at least 45-60 minutes, stirring occasionally. Resist the urge to rush this step, as it's the foundation of the soup's rich flavor.
- • If Gruyère is unavailable, Comté or a good quality aged Emmental can be used, offering a similar nutty flavor and excellent melting properties for the gratinée topping.
- • The soup base (without bread and cheese) can be made ahead and refrigerated for up to 3 days or frozen for up to 3 months. Reheat gently on the stovetop and then proceed with the baguette and cheese topping just before serving.
- • Serve French Onion Soup as a hearty appetizer or a light main course, accompanied by a simple, crisp green salad with a vinaigrette dressing. The acidity of the salad beautifully cuts through the richness of the soup.
Nutrition Facts
Per serving (approximate)