Classic French Onion Soup

Classic French Onion Soup

3.47 from 13 votes

Transform humble ingredients into a gourmet masterpiece. This classic French Onion Soup features a rich, savory beef broth loaded with deeply caramelized onions and topped with a crispy toasted baguette slice smothered in bubbling, golden Gruyère cheese. It is a slow-simmered labor of love that delivers incredible depth of flavor.

Servings 4 people

Prep Time 15 minutes mins

Cook Time 1 hour hr

Total Time 1 hour hr 15 minutes mins

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Ingredients

  

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• 3 tbsp Unsalted butter (for caramelizing)
• 1 tbsp Olive oil
• 5 large Yellow onions (peeled, halved, and thinly sliced)
• 3 cloves Garlic (minced)
• 1/2 cup Dry white wine (or dry sherry, for deglazing)
• 6 cups Beef broth (high-quality, low sodium)
• 3 sprigs Fresh thyme (or 1 tsp dried thyme)
• 1 tsp Salt (or to taste)
• 1/2 tsp Black pepper (freshly ground)
• 4 slices French baguette (cut 1-inch thick and toasted)
• 1.5 cups Gruyère cheese (freshly grated)

Instructions

 

• Heat the butter and olive oil in a large Dutch oven or heavy-bottomed pot over medium heat.
• Add the sliced onions and toss to coat in the butter/oil. Cook uncovered, stirring occasionally, for 40 to 45 minutes. The onions will shrink significantly and slowly turn a deep, rich caramelized brown. Do not rush this step!
• Once the onions are perfectly caramelized, stir in the minced garlic and cook for 1 minute until fragrant.
• Pour in the white wine to deglaze the pot, using a wooden spoon to scrape up all the beautiful browned bits from the bottom. Let the wine simmer until mostly evaporated.
• Pour in the beef broth, add the fresh thyme sprigs, salt, and black pepper. Bring to a gentle boil, then reduce the heat, cover, and simmer for 15-20 minutes to meld the flavors.
• While the soup simmers, preheat your oven's broiler. Place four oven-safe soup crocks or bowls onto a sturdy baking sheet.
• Remove the thyme sprigs. Ladle the hot soup evenly into the bowls. Top each bowl with a toasted baguette slice and generously sprinkle the grated Gruyère cheese over the bread and the edges of the bowl.
• Carefully transfer the baking sheet to the oven. Broil for 2-4 minutes, watching very closely, until the cheese is melted, bubbly, and beautifully golden brown. Serve immediately!

Nutrition

Calories: 319kcalCarbohydrates: 35gProtein: 10gFat: 14gSaturated Fat: 7gPolyunsaturated Fat: 1gMonounsaturated Fat: 5gTrans Fat: 0.3gCholesterol: 23mgSodium: 2129mgPotassium: 549mgFiber: 4gSugar: 10gVitamin A: 303IUVitamin C: 16mgCalcium: 112mgIron: 2mg

Calories: 319kcal

Meal Type: Appetizer, Main Course, Soup

Cuisine: european, French

Keyword: bistro soup, caramelized onions, French onion soup

Cooking Method: broil, sautéing, simmering

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A Triumph of Technique

When it comes to culinary magic, few dishes transform humble ingredients quite like French Onion Soup. This bistro classic relies entirely on technique, making it a proud staple among the top 10 best soup recipes ever. If you are looking for another rustic, slow-simmered European favorite to add to your repertoire, you will absolutely love our hearty Italian Lentil Soup.

Why This Ranks Among the Top 10 Best Soup Recipes Ever

Creating this soup is a labor of love, but the payoff is immense. It is universally celebrated as one of the top 10 best soup recipes ever because it delivers an unparalleled depth of flavor. Here is why the technique is so important:

• The Magic of Caramelization: Slowly cooking the onions breaks down their sharp natural compounds into deep, sweet, savory sugars. This step cannot be rushed on high heat.
• The Cheese Crust: The contrast between the rich, dark broth and the thick layer of melted, gooey Gruyère cheese creates a textural masterpiece that defines comfort food.
• Deglazing the Fond: Using a splash of wine to lift the browned bits off the bottom of the pot ensures that every ounce of flavor developed during caramelization ends up in the broth.

Tips for Perfecting One of the Top 10 Best Soup Recipes Ever

• Patience is Crucial: The onions need at least 40 minutes to properly caramelize. If you turn the heat up to speed the process, you will fry or burn the onions instead of caramelizing them.
• Use Oven-Safe Bowls: Because you need to broil the cheese directly over the soup, you must use authentic, heat-proof soup crocks. Standard ceramic bowls may crack under the intense heat of the broiler!
• The Right Cheese: Gruyère is traditional for a reason. It melts beautifully, has a wonderful nutty flavor, and crisps up perfectly under the broiler. If you can’t find it, a mix of Swiss and Mozzarella works as a substitute.