French Onion Soup
French Onion Soup is a classic French appetizer featuring slow-caramelized yellow onions simmered in a rich beef or vegetable broth, accented with white wine or sherry, fresh herbs, and topped with toasted baguette slices covered in melted Gruyère or Swiss cheese. This comforting soup offers a deep, savory flavor with a golden, bubbling cheese crust, perfect to warm you on chilly evenings or impress guests with elegant simplicity.
- Author: Nina
- Prep Time: 15 minutes
- Cook Time: 1 hour 15 minutes
- Total Time: 1 hour 30 minutes
- Yield: 4 servings 1x
- Category: Appetizers
- Method: Baking
- Cuisine: French
- Diet: Gluten Free (if gluten-free bread is used)
Vegetables and Herbs
- 4 large yellow onions, thinly sliced
- 2 sprigs fresh thyme
- 2 bay leaves
Fats
- 2 tablespoons butter
- 1 tablespoon olive oil
Liquids
- 6 cups beef broth or vegetable broth
- 1 cup dry white wine or sherry
Bakery
- 1 baguette or crusty bread, sliced thickly
Cheese
- 1 1/2 cups Gruyère or Swiss cheese, shredded
Seasonings
- Salt, to taste
- Freshly ground black pepper, to taste
- Caramelize the Onions: Start by slicing the yellow onions thinly and cooking them slowly over medium-low heat with butter and olive oil. Stir frequently for about 45 minutes until they turn a deep golden brown and develop a sweet, rich aroma. This slow caramelization is the secret to unlocking those irresistible flavors.
- Deglaze with Wine: Add dry white wine or sherry to the pot to deglaze, scraping up all the flavorful browned bits stuck to the bottom. This adds brightness and helps layer the complexity of the soup.
- Add Broth and Herbs: Pour in your chosen broth along with fresh thyme and bay leaves. Bring to a gentle simmer and let it cook for an additional 20 to 30 minutes to marry the flavors together beautifully.
- Season and Prepare Bread: Season the soup generously with salt and pepper. Meanwhile, slice your baguette into thick pieces and toast until crisp. This bread will serve as the perfect base for the melted cheese topping.
- Assemble and Broil: Ladle the hot soup into oven-safe bowls, float the toasted bread on top, and generously sprinkle with shredded Gruyère cheese. Place the bowls under a broiler until the cheese melts, bubbles, and forms a golden crust — the signature finish to your French Onion Soup.
Notes
- Patience is key: take your time caramelizing the onions slowly to avoid burning and develop maximum sweetness.
- Use a heavy-bottomed pot to ensure even heat distribution for consistent cooking.
- Don’t skip the deglaze step with wine or sherry; it lifts all the caramelized flavors from the pan and prevents bitterness.
- Choose quality cheese such as Gruyère for nutty flavors and perfect melting.
- Watch the cheese carefully under the broiler to avoid burning while achieving a bubbly golden crust.
Nutrition
- Serving Size: 1 bowl (approximately 350g)
- Calories: 320 kcal
- Sugar: 8 g
- Sodium: 950 mg
- Fat: 18 g
- Saturated Fat: 10 g
- Unsaturated Fat: 6 g
- Trans Fat: 0 g
- Carbohydrates: 28 g
- Fiber: 3 g
- Protein: 14 g
- Cholesterol: 40 mg
Keywords: French Onion Soup, caramelized onions, comfort food, French cuisine, Gruyère, onion soup recipe, cozy soup